--- extra.mk.in	2009-07-28 22:31:43.000000000 +0300
+++ extra.mk.in	2009-07-28 22:32:15.000000000 +0300
@@ -383,5 +383,5 @@ 
 GTKGLEXT_CFLAGS ?= @GTKGLEXT_CFLAGS@
 GTKGLEXT_LIBS ?= @GTKGLEXT_LIBS@
 TR = @TR@
-PLUGIN_DEFNAME := `echo ${subst ${PLUGIN_SUFFIX},,${PLUGIN}} | tr '[:lower:]' '[:upper:]' | tr '-' '_'`
+PLUGIN_DEFNAME := `echo ${subst ${PLUGIN_SUFFIX},,${PLUGIN}} | LC_ALL=C tr '[:lower:]' '[:upper:]' | tr '-' '_'`
 PLUGIN_CPPFLAGS += -D${PLUGIN_DEFNAME}_CFGID="\"${subst ${PLUGIN_SUFFIX},,${PLUGIN}}\""