--- a/allmakefiles.sh
+++ b/allmakefiles.sh
@@ -1332,17 +1332,17 @@ fi
 fi
 
 if [ "$MOZ_PREF_EXTENSIONS" ]; then
   MOZ_EXTENSIONS="$MOZ_EXTENSIONS pref"
 fi
 
 for extension in $MOZ_EXTENSIONS; do
   if [ -f "${srcdir}/extensions/${extension}/makefiles.sh" ]; then
-    source "${srcdir}/extensions/${extension}/makefiles.sh"
+    . "${srcdir}/extensions/${extension}/makefiles.sh"
   fi
 done
 
 MAKEFILES_themes=`cat ${srcdir}/themes/makefiles`
 
 add_makefiles "
 $MAKEFILES_caps
 $MAKEFILES_chrome
@@ -1462,10 +1462,10 @@ if test -n "$MOZ_ENABLE_GTK2"; then
     add_makefiles "$MAKEFILES_gnome"
 fi
 
 if test -n "$MOZ_STORAGE"; then
     add_makefiles "$MAKEFILES_storage"
 fi
 
 if test -f "${srcdir}/${MOZ_BUILD_APP}/makefiles.sh"; then
-  source "${srcdir}/${MOZ_BUILD_APP}/makefiles.sh"
+  . "${srcdir}/${MOZ_BUILD_APP}/makefiles.sh"
 fi

--- a/configure.in
+++ b/configure.in
@@ -4318,17 +4318,17 @@ else
   fi
 fi
 
 # Allow the application to influence configure with a confvars.sh script.
 
 AC_MSG_CHECKING([if app-specific confvars.sh exists])
 if test -f "${srcdir}/${MOZ_BUILD_APP}/confvars.sh" ; then
   AC_MSG_RESULT([${srcdir}/${MOZ_BUILD_APP}/confvars.sh])
-  source "${srcdir}/${MOZ_BUILD_APP}/confvars.sh"
+  . "${srcdir}/${MOZ_BUILD_APP}/confvars.sh"
 else
   AC_MSG_RESULT([no])
 fi
 
 # Now is a good time to test for logic errors, define mismatches, etc.
 case "$MOZ_BUILD_APP" in
 xulrunner)
   if test "$LIBXUL_SDK"; then