In file included from /usr/local/src/Mozilla/mozilla-central/obj-firefox-64bit/netwerk/protocol/about/Unified_cpp_protocol_about0.cpp:11: /usr/local/src/Mozilla/mozilla-central/netwerk/protocol/about/nsAboutBloat.cpp:94:9: error: unknown type name 'PRExplodedTime' PRExplodedTime expTime; ^ libother-licenses_snappy.a.desc rm -f libother-licenses_snappy.a /usr/local/src/Mozilla/mozilla-central/netwerk/protocol/about/nsAboutBloat.cpp:95:24: error: use of undeclared identifier 'PR_Now'; did you mean 'JS_Now'? PR_ExplodeTime(PR_Now(), PR_LocalTimeParameters, &expTime); ^~~~~~ JS_Now ../../../dist/include/jsapi.h:937:1: note: 'JS_Now' declared here JS_Now(void); ^ /usr/local/src/Mozilla/mozilla-central/obj-firefox-64bit/_virtualenv/bin/python /usr/local/src/Mozilla/mozilla-central/config/expandlibs_gen.py -o libother-licenses_snappy.a.desc Unified_cpp_snappy0.o In file included from /usr/local/src/Mozilla/mozilla-central/obj-firefox-64bit/netwerk/protocol/about/Unified_cpp_protocol_about0.cpp:11: /usr/local/src/Mozilla/mozilla-central/netwerk/protocol/about/nsAboutBloat.cpp:95:34: error: use of undeclared identifier 'PR_LocalTimeParameters' PR_ExplodeTime(PR_Now(), PR_LocalTimeParameters, &expTime); I see these on the Mac, doing my own self builds. But I expect they can happen on all platforms. I have no idea why this bug hasn't broken Mozilla's own m-c nightly builds -- it really should have. This bug was triggered by the patches for bug 905127. The fix is very simple. I'll post it in my next comment.

Apparently bug 905127 changed nsNetUtil.h so that it no longer includes prtime.h, even indirectly. But all we need is prtime.h, so we should just include that directly.

Are you using non-unified builds, by chance?

I see the same errors whether nsAboutBloat.cpp is part of a unified build or not.

I didn't try disabling unified builds altogether, though.

But yes, I see how using unified builds might have papered over this bug. I suppose we should do totally non-unified builds periodically on our official build machines, just to uncover bugs like this.

Another thing: Almost all my builds are from-scratch. That my be why I always saw this bug.