The .mozconfig.json handling added for Bug 1543982 seems to be a tiny bit off. I think the Gradle JSON parsing at https://searchfox.org/mozilla-central/rev/9bb55ae4d808fc48afcf93f99da6a685265b86c6/settings.gradle#71 isn't robust when that file is missing. Easy enough to fix, I imagine.

nalexander@roboto ~/M/gecko> ./mach build
 /Users/nalexander/Mozilla/objdirs/objdir-droid/config.status is out of date with respect to /Users/nalexander/Mozilla/gecko/build/moz.configure/toolchain.configure
 0:09.14 Automatically clobbering /Users/nalexander/Mozilla/objdirs/objdir-droid
 0:09.14 Successfully completed auto clobber.
 0:09.14 Adding make options from /Users/nalexander/Mozilla/gecko/mozconfig
    AUTOCLOBBER=1
    MOZ_OBJDIR=/Users/nalexander/Mozilla/objdirs/objdir-droid
    OBJDIR=/Users/nalexander/Mozilla/objdirs/objdir-droid
    FOUND_MOZCONFIG=/Users/nalexander/Mozilla/gecko/mozconfig
    export FOUND_MOZCONFIG
 0:09.17 /usr/bin/make -f client.mk -s configure
 0:09.20 cd /Users/nalexander/Mozilla/objdirs/objdir-droid
 0:09.20 /Users/nalexander/Mozilla/gecko/configure
 0:09.39 Creating Python environment
 0:11.49 New python executable in /Users/nalexander/Mozilla/objdirs/objdir-droid/_virtualenvs/init/bin/python2.7
 0:11.49 Also creating executable in /Users/nalexander/Mozilla/objdirs/objdir-droid/_virtualenvs/init/bin/python
 0:11.49 Installing setuptools, pip, wheel...done.
 0:11.81 running build_ext
 0:11.81 copying build/lib.macosx-10.14-x86_64-2.7/psutil/_psutil_osx.so -> psutil
 0:11.81 copying build/lib.macosx-10.14-x86_64-2.7/psutil/_psutil_posix.so -> psutil
 0:11.81 Error processing command. Ignoring because optional. (optional:packages.txt:comm/build/virtualenv_packages.txt)
 0:11.81 Reexecuting in the virtualenv
 0:12.03 Adding configure options from /Users/nalexander/Mozilla/gecko/mozconfig
 0:12.03   --enable-application=mobile/android
 0:12.03   --target=i686
 0:12.03   --enable-artifact-builds
 0:12.03   --with-java-bin-path=/Library/Java/Home/bin
 0:12.03 checking for vcs source checkout... hg
 0:12.44 checking for a shell... /bin/sh
 0:12.53 checking for host system type... x86_64-apple-darwin18.6.0
 0:12.53 checking for target system type... i686-unknown-linux-android
 0:12.70 checking whether cross compiling... yes
 0:12.89 checking for Python 3... /usr/local/bin/python3 (3.7.3)
 0:12.89 checking for hg... /usr/local/bin/hg
 0:13.13 checking for Mercurial version... 5.0.2
 0:13.42 checking for sparse checkout... no
 0:13.51 checking for nodejs... /Users/nalexander/.mozbuild/node/bin/node (8.11.3)
 0:13.52 checking for tar... /usr/local/bin/gtar
 0:13.52 checking for unzip... /usr/bin/unzip
 0:13.52 checking for zip... /usr/bin/zip
 0:13.52 checking for gn... not found
 0:13.52 checking for the Mozilla API key... no
 0:13.52 checking for the Google Location Service API key... no
 0:13.52 checking for the Google Safebrowsing API key... no
 0:13.52 checking for the Bing API key... no
 0:13.52 checking for the Adjust SDK key... no
 0:13.52 checking for the Leanplum SDK key... no
 0:13.52 checking for the Pocket API key... no
 0:13.53 checking for Android build-tools... [u'/Users/nalexander/.mozbuild/android-sdk-macosx/build-tools/28.0.3']
 0:13.53 checking for Android tools... /Users/nalexander/.mozbuild/android-sdk-macosx/tools
 0:13.54 checking for Android platform-tools... [u'/Users/nalexander/.mozbuild/android-sdk-macosx/platform-tools']
 0:13.54 checking for zipalign... /Users/nalexander/.mozbuild/android-sdk-macosx/build-tools/28.0.3/zipalign
 0:13.54 checking for adb... /Users/nalexander/.mozbuild/android-sdk-macosx/platform-tools/adb
 0:13.54 checking for emulator... /Users/nalexander/.mozbuild/android-sdk-macosx/emulator/emulator
 0:13.55 checking for java... /Library/Java/Home/bin/java
 0:13.55 checking for jarsigner... /Library/Java/Home/bin/jarsigner
 0:13.55 checking for keytool... /Library/Java/Home/bin/keytool
 0:13.56 checking for awk... /usr/bin/awk
 0:13.56 checking for perl... /usr/bin/perl
 0:13.62 checking for minimum required perl version >= 5.006... 5.018004
 0:13.66 checking for full perl installation... yes
 0:13.66 checking for gmake... /Applications/Xcode.app/Contents/Developer/usr/bin/make
 0:13.68 checking for watchman... /usr/local/bin/watchman
 0:13.68 checking for watchman version... 4.9.0
 0:13.68 checking for watchman Mercurial integration... yes
 0:13.68 checking for xargs... /usr/bin/xargs
 0:13.69 checking for autoconf... /usr/local/bin/autoconf213
 0:14.15 creating cache ./config.cache
 0:14.18 checking host system type... x86_64-apple-darwin18.6.0
 0:14.20 checking target system type... i686-unknown-linux-android
 0:14.23 checking build system type... x86_64-apple-darwin18.6.0
 0:14.27 checking NSPR selection... source-tree
 0:14.27 checking if app-specific confvars.sh exists... /Users/nalexander/Mozilla/gecko/mobile/android/confvars.sh
 0:14.44 checking for wget... wget
 0:14.65 checking for fdatasync... yes
 0:14.83 updating cache ./config.cache
 0:14.84 creating ./config.data
 0:14.88 Creating config.status
 0:15.20 Reticulating splines...
 0:16.79  0:01.61 File already read. Skipping: /Users/nalexander/Mozilla/gecko/gfx/angle/targets/angle_common/moz.build
 0:23.68 Finished reading 1118 moz.build files in 3.01s
 0:23.68 Read 0 gyp files in parallel contributing 0.00s to total wall time
 0:23.68 Processed into 5460 build config descriptors in 3.14s
 0:23.68 FasterMake+RecursiveMake backend executed in 1.40s
 0:23.68   1625 total backend files; 1625 created; 0 updated; 0 unchanged; 0 deleted
 0:23.68 Total wall time: 8.51s; CPU time: 6.88s; Efficiency: 81%; Untracked: 0.96s
 0:23.68 =============
 0:23.68 ADVERTISEMENT
 0:23.69 You are building Firefox for Android. After your build completes, you can open
 0:23.69 the top source directory in Android Studio directly and build using Gradle.
 0:23.69 See the documentation at
 0:23.69 https://developer.mozilla.org/en-US/docs/Simple_Firefox_for_Android_build
 0:23.69 =============
Configure complete!
Be sure to run |mach build| to pick up any changes
 0:23.95 Clobber not needed.
 0:23.95 Adding make options from /Users/nalexander/Mozilla/gecko/mozconfig
    AUTOCLOBBER=1
    MOZ_OBJDIR=/Users/nalexander/Mozilla/objdirs/objdir-droid
    OBJDIR=/Users/nalexander/Mozilla/objdirs/objdir-droid
    FOUND_MOZCONFIG=/Users/nalexander/Mozilla/gecko/mozconfig
    export FOUND_MOZCONFIG
 0:23.97 /usr/bin/make -f client.mk -s
 0:27.50 hg suggested 500 candidate revisions
 0:27.50 hg suggested candidate revision: 5f26741abcac98035b471c50b9ef8db0250857b3
 0:27.50 hg suggested candidate revision: c571cbadb397cf2873cc9726df7038c4e9a99c7f
 0:27.50 hg suggested candidate revision: 80898589e1b159b81cba7a76d3ac23dce8bd5f1e
 0:27.50 hg suggested candidate revision: 109f0deb14a403dd46a19c962e68ed66059e0b43
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 0:27.50 hg suggested candidate revision: dc39c5293563d3f78bb404512845078e23c033c4
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 0:27.53 hg suggested candidate revision: 985b80393c06a093b1a0cc946319449ef00099b8
 0:27.53 hg suggested candidate revision: and 480 more
 0:27.53 Attempting to find a pushhead containing 5f26741abcac98035b471c50b9ef8db0250857b3 on mozilla-central.
 0:27.79 Attempting to find a pushhead containing 5f26741abcac98035b471c50b9ef8db0250857b3 on integration/autoland.
 0:28.23 Attempting to find a pushhead containing 5f26741abcac98035b471c50b9ef8db0250857b3 on integration/mozilla-inbound.
 0:28.50 Attempting to find a pushhead containing 5f26741abcac98035b471c50b9ef8db0250857b3 on releases/mozilla-beta.
 0:28.88 Attempting to find a pushhead containing 5f26741abcac98035b471c50b9ef8db0250857b3 on releases/mozilla-release.
 0:29.21 Retrieving the last 50 pushheads starting with id 94315 on integration/autoland
 0:29.74 Retrieving the last 50 pushheads starting with id 114022 on integration/mozilla-inbound
 0:29.97 Retrieving the last 50 pushheads starting with id 36527 on mozilla-central
 0:30.24 Trying to find artifacts for hg revision 5f26741abcac98035b471c50b9ef8db0250857b3 on tree integration/autoland.
 0:30.24 Searching Taskcluster index with namespace: gecko.v2.autoland.revision.5f26741abcac98035b471c50b9ef8db0250857b3.mobile.android-x86-opt
 0:31.51 Not yielding artifact named public/build/build_resources.html as a candidate artifact
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 0:31.51 Not yielding artifact named public/build/host/bin/mar as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856-javadoc.jar as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856-javadoc.jar.md5 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856-javadoc.jar.sha1 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856-sources.jar as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856-sources.jar.md5 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856-sources.jar.sha1 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856.aar as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856.aar.md5 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856.aar.sha1 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856.pom as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856.pom.md5 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/71.0.20190903095856/geckoview-default-x86-71.0.20190903095856.pom.sha1 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/maven-metadata.xml as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/maven-metadata.xml.md5 as a candidate artifact
 0:31.51 Not yielding artifact named public/build/maven/org/mozilla/geckoview/geckoview-default-x86/maven-metadata.xml.sha1 as a candidate artifact
 0:31.52 Not yielding artifact named public/build/mozharness.zip as a candidate artifact
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 0:31.52 Not yielding artifact named public/build/target_info.txt as a candidate artifact
 0:31.52 Not yielding artifact named public/build/toolchains.json as a candidate artifact
 0:31.52 Not yielding artifact named public/chain-of-trust.json as a candidate artifact
 0:31.52 Not yielding artifact named public/chain-of-trust.json.sig as a candidate artifact
 0:31.52 Not yielding artifact named public/logs/certified.log as a candidate artifact
 0:31.52 Not yielding artifact named public/logs/live.log as a candidate artifact
 0:31.52 Not yielding artifact named public/logs/live_backing.log as a candidate artifact
 0:31.52 Not yielding artifact named public/logs/localconfig.json as a candidate artifact
 0:31.52 Installing from remote pushhead 5f26741abcac98035b471c50b9ef8db0250857b3 on integration/autoland
 0:31.52 Installing from https://queue.taskcluster.net/v1/task/ZpDDVAlDQpyu7AcHRWXAGw/artifacts/public/build/target.apk
 0:31.52 Downloading to temporary location /Users/nalexander/.mozbuild/package-frontend/451d148203031d27-target.apk
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 0:34.35 Purged artifact /Users/nalexander/.mozbuild/package-frontend/5ac536830d223764-target.apk
 0:34.35 Downloaded artifact to /Users/nalexander/.mozbuild/package-frontend/451d148203031d27-target.apk
 0:34.35 Installing from /Users/nalexander/.mozbuild/package-frontend/451d148203031d27-target.apk
 0:34.35 Processing contents of /Users/nalexander/.mozbuild/package-frontend/451d148203031d27-target.apk
 0:34.35 Writing processed /Users/nalexander/.mozbuild/package-frontend/451d148203031d27-target.apk.processed.jar
 0:35.58 Adding libfreebl3.so to processed archive
 0:35.58 Adding liblgpllibs.so to processed archive
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 0:35.58 Adding libmozglue.so to processed archive
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 0:35.58 Adding libplugin-container.so to processed archive
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 0:35.59 Adding application.ini to processed archive
 0:35.59 Adding platform.ini to processed archive
 0:35.65 Installing from processed /Users/nalexander/.mozbuild/package-frontend/451d148203031d27-target.apk.processed.jar
 0:35.66 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/libfreebl3.so
 0:35.66 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/liblgpllibs.so
 0:35.66 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/libmozavcodec.so
 0:35.66 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/libmozavutil.so
 0:35.68 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/libmozglue.so
 0:35.72 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/libnss3.so
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 0:36.78 Installing from https://queue.taskcluster.net/v1/task/ZpDDVAlDQpyu7AcHRWXAGw/artifacts/public/build/target.common.tests.tar.gz
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 0:47.28 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-clearkey/0.1/manifest.json
 0:47.33 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-fake/1.0/libfake.so
 0:47.33 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-fake/1.0/manifest.json
 0:47.33 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-fakeopenh264/1.0/fakeopenh264.info
 0:47.37 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-fakeopenh264/1.0/libfakeopenh264.so
 0:47.37 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/ssltunnel
 0:47.38 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/xpcshell
 0:47.38 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/testing/mochitest/automation.py
 0:47.40 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/testing/mochitest/chrome/toolkit/components/ctypes/tests/chrome/libjsctypes-test.so
 0:47.40 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/testing/mochitest/tests/layout/style/test/css_properties.js
 0:47.40 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/netwerk/dns/tests/unit/data/fake_remote_dafsa.bin
 0:47.40 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/services/settings/test/unit/test_remote_settings_signatures/collection_signing_ee.pem
 0:47.40 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/services/settings/test/unit/test_remote_settings_signatures/collection_signing_int.pem
 0:47.40 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/services/settings/test/unit/test_remote_settings_signatures/collection_signing_root.pem
 0:47.42 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/toolkit/components/ctypes/tests/unit/libjsctypes-test.so
 0:47.43 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/toolkit/components/telemetry/tests/unit/libmodules-test.so
 0:47.44 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/toolkit/crashreporter/test/libtestcrasher.so
 0:47.44 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/uriloader/exthandler/tests/unit/WriteArgument
 0:47.48 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/xpcom/tests/unit/TestArguments
 0:47.53 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/xpcom/tests/unit/TestBlockingProcess
 0:47.57 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/xpcom/tests/unit/TestPRIntN
 0:47.61 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/xpcom/tests/unit/TestQuickReturn
 0:47.66 Updating /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/../_tests/xpcshell/xpcom/tests/unit/TestUnicodeArguments
 0:47.97 toolkit/components/featuregates/feature_definitions.json.stub
 0:47.97 toolkit/locales/multilocale.txt.stub
 0:47.98 toolkit/components/telemetry/ScalarArtifactDefinitions.json.stub
 0:47.98 ./buildid.h.stub
 0:47.98 toolkit/components/telemetry/EventArtifactDefinitions.json.stub
 0:47.98 ./source-repo.h.stub
 0:47.98 toolkit/locales/update.locale.stub
 0:48.37 Elapsed: 0.00s; From dist/private: Kept 0 existing; Added/updated 0; Removed 0 files and 0 directories.
 0:48.37 Elapsed: 0.00s; From dist/public: Kept 0 existing; Added/updated 0; Removed 0 files and 0 directories.
 0:48.39 toolkit/mozapps/extensions/built_in_addons.json.stub
 0:48.39 devtools/shared/webconsole/reserved-js-words.js.stub
 0:48.40 Elapsed: 0.02s; From dist/xpi-stage: Kept 0 existing; Added/updated 55; Removed 0 files and 0 directories.
 0:48.43 Elapsed: 0.05s; From dist/include: Kept 766 existing; Added/updated 0; Removed 0 files and 0 directories.
 0:48.48 mobile/android/base/AdjustConstants.java.stub
 0:48.48 mobile/android/base/AndroidManifest.xml.stub
 0:48.48 mobile/android/base/CrashReporterConstants.java.stub
 0:48.48 mobile/android/base/AppConstants.java.stub
 0:48.48 mobile/android/base/MmaConstants.java.stub
 0:48.54 mobile/android/base/suggestedsites.json.stub
 0:48.74 mobile/android/base/strings.xml.stub
 0:48.93 Reading 2 suggested site lists: ['browser.suggestedsites.list', 'browser.suggestedsites.restricted.list']
 0:48.93 Reading 5 suggested sites from browser.suggestedsites.list: [u'facebook', u'youtube', u'amazon', u'wikipedia', u'twitter']
 0:48.93 Found 5 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'facebook': [u'drawable-hdpi/suggestedsites_facebook.png', u'drawable-mdpi/suggestedsites_facebook.png', u'drawable-xhdpi/suggestedsites_facebook.png', u'drawable-xxhdpi/suggestedsites_facebook.png', u'drawable-xxxhdpi/suggestedsites_facebook.png']
 0:48.93 Found 5 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'youtube': [u'drawable-hdpi/suggestedsites_youtube.png', u'drawable-mdpi/suggestedsites_youtube.png', u'drawable-xhdpi/suggestedsites_youtube.png', u'drawable-xxhdpi/suggestedsites_youtube.png', u'drawable-xxxhdpi/suggestedsites_youtube.png']
 0:48.93 Found 5 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'amazon': [u'drawable-hdpi/suggestedsites_amazon.png', u'drawable-mdpi/suggestedsites_amazon.png', u'drawable-xhdpi/suggestedsites_amazon.png', u'drawable-xxhdpi/suggestedsites_amazon.png', u'drawable-xxxhdpi/suggestedsites_amazon.png']
 0:48.93 Found 5 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'wikipedia': [u'drawable-hdpi/suggestedsites_wikipedia.png', u'drawable-mdpi/suggestedsites_wikipedia.png', u'drawable-xhdpi/suggestedsites_wikipedia.png', u'drawable-xxhdpi/suggestedsites_wikipedia.png', u'drawable-xxxhdpi/suggestedsites_wikipedia.png']
 0:48.93 Found 5 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'twitter': [u'drawable-hdpi/suggestedsites_twitter.png', u'drawable-mdpi/suggestedsites_twitter.png', u'drawable-xhdpi/suggestedsites_twitter.png', u'drawable-xxhdpi/suggestedsites_twitter.png', u'drawable-xxxhdpi/suggestedsites_twitter.png']
 0:48.93 Reading 3 suggested sites from browser.suggestedsites.restricted.list: [u'restricted_fxsupport', u'webmaker', u'restricted_mozilla']
 0:48.93 Found 1 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'restricted_fxsupport': [u'drawable-xhdpi/suggestedsites_restricted_fxsupport.png']
 0:48.93 Found 1 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'webmaker': [u'drawable-xhdpi/suggestedsites_webmaker.png']
 0:48.93 Found 1 drawables in '/Users/nalexander/Mozilla/gecko/mobile/android/app/src/main/res' for 'restricted_mozilla': [u'drawable-xhdpi/suggestedsites_restricted_mozilla.png']
 0:48.93 /Users/nalexander/Mozilla/objdirs/objdir-droid/mobile/android/base/res/raw/suggestedsites.json updated
 0:49.09 Elapsed: 0.71s; From _tests: Kept 17 existing; Added/updated 1280; Removed 0 files and 0 directories.
 0:49.32 build/application.ini.stub
 0:49.50 Elapsed: 0.00s; From /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-fakeopenh264/1.0: Kept 0 existing; Added/updated 1; Removed 0 files and 0 directories.
 0:49.50 Elapsed: 0.00s; From /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-fake/1.0: Kept 0 existing; Added/updated 1; Removed 0 files and 0 directories.
 0:49.51 Elapsed: 0.02s; From /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/localization: Kept 0 existing; Added/updated 29; Removed 0 files and 0 directories.
 0:49.53 Elapsed: 0.03s; From /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin/gmp-clearkey/0.1: Kept 0 existing; Added/updated 1; Removed 0 files and 0 directories.
 0:50.10 Elapsed: 0.40s; From /Users/nalexander/Mozilla/objdirs/objdir-droid/dist/bin: Kept 0 existing; Added/updated 1884; Removed 0 files and 0 directories.
 0:50.18 mobile/android/base/android_apks.stub
 0:51.22  0:00.77 /Users/nalexander/Mozilla/gecko/gradlew geckoview:generateJNIWrappersForGeneratedWithGeckoBinariesDebug app:generateJNIWrappersForFennecWithoutGeckoBinariesDebug app:assembleWithoutGeckoBinariesDebug app:assembleWithoutGeckoBinariesDebugAndroidTest -x lint
 0:51.43 Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=utf-8
 0:52.16 Starting a Gradle Daemon (subsequent builds will be faster)
 0:55.66 FAILURE: Build failed with an exception.
 0:55.66 * Where:
 0:55.66 Settings file '/Users/nalexander/Mozilla/gecko/settings.gradle' line: 71
 0:55.66 * What went wrong:
 0:55.66 A problem occurred evaluating settings 'gecko'.
 0:55.66 > Unable to process file: /Users/nalexander/Mozilla/objdirs/objdir-droid/.mozconfig.json
 0:55.66 * Try:
 0:55.66 Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
 0:55.66 * Get more help at https://help.gradle.org
 0:55.66 BUILD FAILED in 4s
 0:56.11 Traceback (most recent call last):
 0:56.11   File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 174, in _run_module_as_main
 0:56.11     "__main__", fname, loader, pkg_name)
 0:56.11   File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
 0:56.11     exec code in run_globals
 0:56.11   File "/Users/nalexander/Mozilla/gecko/python/mozbuild/mozbuild/action/file_generate.py", line 121, in <module>
 0:56.11     sys.exit(main(sys.argv[1:]))
 0:56.11   File "/Users/nalexander/Mozilla/gecko/python/mozbuild/mozbuild/action/file_generate.py", line 71, in main
 0:56.11     ret = module.__dict__[method](output, *args.additional_arguments, **kwargs)
 0:56.11   File "/Users/nalexander/Mozilla/gecko/mobile/android/gradle.py", line 55, in assemble_app
 0:56.11     return android('assemble-app')
 0:56.11   File "/Users/nalexander/Mozilla/gecko/mobile/android/gradle.py", line 49, in android
 0:56.11     subprocess.check_call(cmd, env=env)
 0:56.11   File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 190, in check_call
 0:56.12     raise CalledProcessError(retcode, cmd)
 0:56.12 subprocess.CalledProcessError: Command '['/Users/nalexander/Mozilla/objdirs/objdir-droid/_virtualenvs/init/bin/python', u'/Users/nalexander/Mozilla/gecko/mach', 'android', 'assemble-app']' returned non-zero exit status 1
 0:56.12 make[4]: *** [.deps/android_apks.stub] Error 1
 0:56.12 make[3]: *** [mobile/android/base/export] Error 2
 0:56.12 make[2]: *** [export] Error 2
 0:56.12 make[1]: *** [default] Error 2
 0:56.12 make: *** [build] Error 2
 0:56.14 142 compiler warnings present.

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

The priority flag is not set for this bug.
:nalexander, could you have a look please?

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