Use the same workaround that Mk/bsd.gecko.mk uses by diddling with the

generated config files rather than patching the sources.

(As a side note, there is an Mk/bsd.gecko.mk!)

3rdp/build/GNUmakefile

@@ -30,7 +30,7 @@ $(JSLIB_BUILD): $(3RDP_ROOT)$(DIRSEP)dist/libmozjs.tgz | $(JS_SRC) $(JS_IDIR)
 	@echo Creating $@ ...
 	$(QUIET)-rm -rf $(JS_SRC)/*
 	$(QUIET)tar -xzC $(JS_SRC) -f $(3RDPDISTDIR)$(DIRSEP)libmozjs.tgz
-	$(QUIET)patch -d $(JS_SRC) < jsnativestack.cpp.patch
+	$(QUIET)echo "pthread_np.h" >> $(JS_SRC)$(DIRSEP)js-1.8.5$(DIRSEP)js$(DIRSEP)src$(DIRSEP)config$(DIRSEP)system-headers
 	-$(QUIET)cd $(JS_SRC)$(DIRSEP)js-1.8.5$(DIRSEP)js$(DIRSEP)src && autoconf-2.13
 	$(QUIET)cd $(JS_SRC)$(DIRSEP)js-1.8.5$(DIRSEP)js$(DIRSEP)src && ./configure $(JS_CONFIGURE_ARGS)
 	$(QUIET)$(MAKE) -C $(JS_SRC)$(DIRSEP)js-1.8.5$(DIRSEP)js$(DIRSEP)src

3rdp/build/jsnativestack.cpp.patch

---- js-1.8.5/js/src/jsnativestack.cpp.orig	2011-11-01 00:58:59.000000000 -0700
-+++ js-1.8.5/js/src/jsnativestack.cpp	2011-11-01 01:02:48.000000000 -0700
-@@ -48,11 +48,13 @@
- # include <os2.h>
- 
- #elif defined(XP_MACOSX) || defined(DARWIN) || defined(XP_UNIX)
-+# pragma GCC visibility push(default)
- # include <pthread.h>
- 
- # if defined(__FreeBSD__)
- #  include <pthread_np.h>
- # endif
-+# pragma GCC visibility pop
- 
- #else
- # error "Unsupported platform"