22735084 harfbuzz can fail to build if somebody else built it on the same machine
--- a/components/desktop/harfbuzz/Makefile Thu Feb 18 08:23:39 2016 -0800
+++ b/components/desktop/harfbuzz/Makefile Thu Feb 18 10:21:52 2016 -0800
@@ -54,6 +54,9 @@
COMPILER = gcc
CXXFLAGS += -std=c++11
+# For components using gobject-introspection, don't cache results in $HOME
+COMPONENT_BUILD_ENV += GI_SCANNER_DISABLE_CACHE=yes
+
CONFIGURE_ENV += CC="$(CC) $(CC_BITS)"
CONFIGURE_ENV += CFLAGS="$(CFLAGS)"
CONFIGURE_ENV += CPPFLAGS="$(CPPFLAGS)"