diff -upU8 thunderbird-3.0/mail/installer/Makefile.in.shared-error thunderbird-3.0/mail/installer/Makefile.in
--- thunderbird-3.0/mail/installer/Makefile.in.shared-error	2009-02-24 03:16:03.000000000 +0100
+++ thunderbird-3.0/mail/installer/Makefile.in	2009-02-27 16:02:31.000000000 +0100
@@ -56,16 +56,17 @@ NO_PKG_FILES = \
 	PalmSyncInstall.exe \
 	$(NULL)
 
 include $(topsrcdir)/config/rules.mk
 
 MOZ_PKG_REMOVALS = $(srcdir)/removed-files.in
 
 ifdef BUILD_STATIC_LIBS
+ifeq (BUILD_STATIC_LIBS, 1)
 ifeq (WINNT,$(OS_ARCH))
 MOZ_PKG_MANIFEST_P = $(srcdir)/windows/packages-static
 endif
 else
 $(error you need a "--enable-static --disable-shared" build to create an installer)
 endif
 
 MOZ_NONLOCALIZED_PKG_LIST = \
@@ -80,16 +81,17 @@ MOZ_LOCALIZED_PKG_LIST = $(AB_CD)
 DEFINES += -DAB_CD=$(AB_CD)
 
 ifdef MOZ_PKG_MANIFEST_P
 MOZ_PKG_MANIFEST = packages-static
 
 $(MOZ_PKG_MANIFEST): $(MOZ_PKG_MANIFEST_P)
 	$(PERL) $(MOZILLA_SRCDIR)/config/preprocessor.pl $(DEFINES) $(ACDEFINES) $< > $@
 endif
+endif
 
 ifneq (,$(filter mac cocoa,$(MOZ_WIDGET_TOOLKIT)))
 MOZ_PKG_MAC_DSSTORE=branding/dsstore
 MOZ_PKG_MAC_BACKGROUND=branding/background.png
 MOZ_PKG_MAC_ICON=branding/disk.icns
 MOZ_PKG_MAC_EXTRA=--symlink "/Applications:/ "
 endif