diff --git a/content/canvas/src/Makefile.in b/content/canvas/src/Makefile.in
index 4a4e99fa89d9..fa2e4a3bd4fe 100644
--- a/content/canvas/src/Makefile.in
+++ b/content/canvas/src/Makefile.in
@@ -45,7 +45,6 @@ include $(DEPTH)/config/autoconf.mk
 MODULE		= content
 LIBRARY_NAME	= gkconcvs_s
 LIBXUL_LIBRARY  = 1
-FAIL_ON_WARNINGS = 1
 
 EXPORTS = \
 	CustomQS_Canvas2D.h \
diff --git a/content/media/wave/Makefile.in b/content/media/wave/Makefile.in
index 0a4b9e6e1431..618b4b30bd58 100644
--- a/content/media/wave/Makefile.in
+++ b/content/media/wave/Makefile.in
@@ -44,7 +44,6 @@ include $(DEPTH)/config/autoconf.mk
 MODULE		= content
 LIBRARY_NAME	= gkconwave_s
 LIBXUL_LIBRARY 	= 1
-FAIL_ON_WARNINGS = 1
 
 
 EXPORTS		+= \
diff --git a/docshell/shistory/src/Makefile.in b/docshell/shistory/src/Makefile.in
index 80f2a5b31f28..3659b02bbf2c 100644
--- a/docshell/shistory/src/Makefile.in
+++ b/docshell/shistory/src/Makefile.in
@@ -47,7 +47,6 @@ MODULE		= shistory
 LIBRARY_NAME	= shistory_s
 FORCE_STATIC_LIB = 1
 LIBXUL_LIBRARY	= 1
-FAIL_ON_WARNINGS = 1
 
 
 CPPSRCS		= nsSHEntry.cpp        \
diff --git a/dom/src/geolocation/Makefile.in b/dom/src/geolocation/Makefile.in
index b38a9f504d00..1bb37af6ebb3 100644
--- a/dom/src/geolocation/Makefile.in
+++ b/dom/src/geolocation/Makefile.in
@@ -44,7 +44,6 @@ include $(DEPTH)/config/autoconf.mk
 MODULE         = dom
 LIBRARY_NAME   = jsdomgeolocation_s
 LIBXUL_LIBRARY = 1
-FAIL_ON_WARNINGS = 1
 
 # we don't want the shared lib, but we want to force the creation of a static lib.
 FORCE_STATIC_LIB = 1
diff --git a/editor/txmgr/src/Makefile.in b/editor/txmgr/src/Makefile.in
index aca1046fb7e4..f08c0a26c6dc 100644
--- a/editor/txmgr/src/Makefile.in
+++ b/editor/txmgr/src/Makefile.in
@@ -48,7 +48,6 @@ EXPORT_LIBRARY = 1
 IS_COMPONENT	= 1
 MODULE_NAME	= nsTransactionManagerModule
 LIBXUL_LIBRARY	= 1
-FAIL_ON_WARNINGS = 1
 
 
 CPPSRCS		= \
diff --git a/toolkit/components/places/tests/cpp/Makefile.in b/toolkit/components/places/tests/cpp/Makefile.in
index 0bdf4a5ae728..c05c0f8b2b61 100644
--- a/toolkit/components/places/tests/cpp/Makefile.in
+++ b/toolkit/components/places/tests/cpp/Makefile.in
@@ -45,7 +45,6 @@ relativesrcdir = toolkit/components/places/tests/cpp
 include $(DEPTH)/config/autoconf.mk
 
 MODULE = test_places
-FAIL_ON_WARNINGS = 1
 
 CPP_UNIT_TESTS = \
   test_IHistory.cpp \
diff --git a/uriloader/base/Makefile.in b/uriloader/base/Makefile.in
index 81125c9cd86d..a04211ccfede 100644
--- a/uriloader/base/Makefile.in
+++ b/uriloader/base/Makefile.in
@@ -46,7 +46,6 @@ MODULE		= uriloader
 LIBRARY_NAME	= uriloaderbase_s
 GRE_MODULE	= 1
 LIBXUL_LIBRARY  = 1
-FAIL_ON_WARNINGS = 1
 
 
 CPPSRCS = 							\