Index: bsd.ruby.mk
===================================================================
--- bsd.ruby.mk	(revision 342164)
+++ bsd.ruby.mk	(working copy)
@@ -186,8 +186,24 @@
 
 RUBY_WRKSRC=		${WRKDIR}/ruby-${RUBY_DISTVERSION}
 
-GEM_ENV?=		LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_CTYPE=UTF-8
+.if defined(LANG) && !empty(LANG)
+GEM_ENV+=		LANG=${LANG}
+.else
+GEM_ENV+=		LANG=en_US.UTF-8
+.fi
 
+.if defined(LC_ALL) && !empty(LC_ALL)
+GEM_ENV+=		LC_ALL=${LC_ALL}
+.else
+GEM_ENV+=		LC_ALL=en_US.UTF-8
+.fi
+
+.if defined(LC_CTYPE) && !empty(LC_CTYPE)
+GEM_ENV+=		LC_CTYPE=${LC_CTYPE}
+.else
+GEM_ENV+=		LC_CTYPE=UTF-8
+.fi
+
 RUBY_CONFIGURE_ARGS+=	--with-rubyhdrdir="${PREFIX}/include/ruby-1.9/" \
 			--with-rubylibprefix="${PREFIX}/lib/ruby" \
 			--docdir="${RUBY_DOCDIR}" \