getting this bustage: ranlib: /lib64/libz.so.1: no version information available (required by ranlib) /builds/slave/c-cen-t-lnx/build/gcc/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.5/../../../../x86_64-unknown-linux-gnu/bin/as: /lib64/libz.so.1: no version information available (required by /builds/slave/c-cen-t-lnx/build/gcc/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.5/../../../../x86_64-unknown-linux-gnu/bin/as) /usr/bin/ccache /builds/slave/c-cen-t-lnx/build/gcc/bin/gcc -m32 -march=pentiumpro -std=gnu99 -o pralarm.o -c -I/builds/slave/c-cen-t-lnx/build/objdir/dist/system_wrappers -include /builds/slave/c-cen-t-lnx/build/mozilla/config/gcc_hidden.h -DNDEBUG=1 -DTRIMMED=1 -D_NSPR_BUILD_ -DHAVE_FCNTL_FILE_LOCKING -D_GNU_SOURCE -DLINUX -Di386 -D_PR_PTHREADS -I/builds/slave/c-cen-t-lnx/build/mozilla/config/external/nspr/pr -I/builds/slave/c-cen-t-lnx/build/objdir/config/external/nspr/pr -I/builds/slave/c-cen-t-lnx/build/mozilla/config/external/nspr -I/builds/slave/c-cen-t-lnx/build/mozilla/nsprpub/pr/include -I/builds/slave/c-cen-t-lnx/build/mozilla/nsprpub/pr/include/private -I/builds/slave/c-cen-t-lnx/build/objdir/dist/include -I/builds/slave/c-cen-t-lnx/build/objdir/dist/include/nspr -I/builds/slave/c-cen-t-lnx/build/objdir/dist/include/nss -fPIC -include /builds/slave/c-cen-t-lnx/build/objdir/mozilla-config.h -DMOZILLA_CLIENT -MD -MP -MF .deps/pralarm.o.pp -Wall -Wempty-body -Wignored-qualifiers -Wpointer-arith -Wsign-compare -Wtype-limits -Wunreachable-code -Wno-error=maybe-uninitialized -Wno-error=deprecated-declarations -Wno-error=array-bounds -gdwarf-2 -fno-strict-aliasing -ffunction-sections -fdata-sections -fno-math-errno -pthread -pipe -gdwarf-2 -freorder-blocks -Os -fno-omit-frame-pointer /builds/slave/c-cen-t-lnx/build/mozilla/nsprpub/pr/src/misc/pralarm.c /builds/slave/c-cen-t-lnx/build/gcc/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.5/../../../../x86_64-unknown-linux-gnu/bin/as: /lib64/libz.so.1: no version information available (required by /builds/slave/c-cen-t-lnx/build/gcc/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.5/../../../../x86_64-unknown-linux-gnu/bin/as) /usr/bin/ccache /builds/slave/c-cen-t-lnx/build/gcc/bin/gcc -m32 -march=pentiumpro -std=gnu99 -o pratom.o -c -I/builds/slave/c-cen-t-lnx/build/objdir/dist/system_wrappers -include /builds/slave/c-cen-t-lnx/build/mozilla/config/gcc_hidden.h -DNDEBUG=1 -DTRIMMED=1 -D_NSPR_BUILD_ -DHAVE_FCNTL_FILE_LOCKING -D_GNU_SOURCE -DLINUX -Di386 -D_PR_PTHREADS -I/builds/slave/c-cen-t-lnx/build/mozilla/config/external/nspr/pr -I/builds/slave/c-cen-t-lnx/build/objdir/config/external/nspr/pr -I/builds/slave/c-cen-t-lnx/build/mozilla/config/external/nspr -I/builds/slave/c-cen-t-lnx/build/mozilla/nsprpub/pr/include -I/builds/slave/c-cen-t-lnx/build/mozilla/nsprpub/pr/include/private -I/builds/slave/c-cen-t-lnx/build/objdir/dist/include -I/builds/slave/c-cen-t-lnx/build/objdir/dist/include/nspr -I/builds/slave/c-cen-t-lnx/build/objdir/dist/include/nss -fPIC -include /builds/slave/c-cen-t-lnx/build/objdir/mozilla-config.h -DMOZILLA_CLIENT -MD -MP -MF .deps/pratom.o.pp -Wall -Wempty-body -Wignored-qualifiers -Wpointer-arith -Wsign-compare -Wtype-limits -Wunreachable-code -Wno-error=maybe-uninitialized -Wno-error=deprecated-declarations -Wno-error=array-bounds -gdwarf-2 -fno-strict-aliasing -ffunction-sections -fdata-sections -fno-math-errno -pthread -pipe -gdwarf-2 -freorder-blocks -Os -fno-omit-frame-pointer /builds/slave/c-cen-t-lnx/build/mozilla/nsprpub/pr/src/misc/pratom.c /builds/slave/c-cen-t-lnx/build/gcc/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.5/../../../../x86_64-unknown-linux-gnu/bin/as: /lib64/libz.so.1: no version information available (required by /builds/slave/c-cen-t-lnx/build/gcc/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.5/../../../../x86_64-unknown-linux-gnu/bin/as) ../../../../mailnews/import/src/nsImportService.cpp: In member function 'virtual nsresult nsProxySendRunnable::Run()': ../../../../mailnews/import/src/nsImportService.cpp:333:54: error: ignoring return value of 'nsresult NS_NewISupportsArray(nsISupportsArray**)', declared with attribute warn_unused_result [-Werror=unused-result] NS_NewISupportsArray(getter_AddRefs(supportsArray)); ^ cc1plus: all warnings being treated as errors make[4]: *** [nsImportService.o] Error 1 make[4]: Leaving directory `/builds/slave/c-cen-t-lnx/build/objdir/mailnews/import/src' make[3]: *** [mailnews/import/src/target] Error 2 make[3]: *** Waiting for unfinished jobs....

I'm guessing this is going to be fixed by the dependent bug.

There is a patch already in bug 1294260... But yes, if bug 1272893 had been fixed, this wouldn't happen.