.a are no longer shipped in the xul sdk (since bug 488175 landed?), meaning no libxpcomglue_s.a so some extensions fail when building firefox with libxul-sdk. For example, here are the logs from a build of trunk on Ubuntu: http://launchpadlibrarian.net/26995935/buildlog_ubuntu-karmic-i386.firefox-3.6_3.6~a1~hg20090520r28667%2Bnobinonly-0ubuntu1~umd2_FAILEDTOBUILD.txt.gz Here is libxpcomglue_s.a with two recent builds: 1.9.2~a1~hg20090513r28291: mozilla/xpcom/glue/libxpcomglue_s.a mozilla/dist/lib/libxpcomglue_s.a (symlink) mozilla/dist/sdk/lib/libxpcomglue_s.a (symlink) usr/lib/xulrunner-devel-1.9.2a1pre/sdk/lib/libxpcomglue_s.a (from make install) 1.9.2~a1~hg20090519r28590: mozilla/xpcom/glue/libxpcomglue_s.a mozilla/dist/lib/libxpcomglue_s.a (symlink) no more libxpcomglue_s.a in dist/sdk/lib, and then not at make install either. If i look at mozilla/dist/sdk/lib now, it just contains nspr and nss, all the other xul libs are gone (both .a and .so).

I overeagerly removed the code which ships stuff to dist/sdk/lib and dist/sdk/bin. I was removing dist/sdk/include and dist/sdk/idl, but the other should remain.