Index: bsd.ruby.mk
===================================================================
--- bsd.ruby.mk	(revision 342164)
+++ bsd.ruby.mk	(working copy)
@@ -186,8 +186,26 @@
 
 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_LANG=		${LANG}
+.else
+_GEM_LANG=		en_US.UTF-8
+.fi
 
+.if defined(LC_ALL) && !empty(LC_ALL)
+_GEM_LANG=		${LC_ALL}
+.else
+_GEM_LANG=		en_US.UTF-8
+.fi
+
+.if defined(LC_CTYPE) && !empty(LC_CTYPE)
+_GEM_LC_CTYPE=		${LC_CTYPE}
+.else
+_GEM_LC_CTYPE=		UTF-8
+.fi
+
+GEM_ENV?=		LANG=${_GEM_LANG} LC_ALL=${_GEM_LC_ALL} LC_CTYPE=${_GEM_LC_CTYPE}
+
 RUBY_CONFIGURE_ARGS+=	--with-rubyhdrdir="${PREFIX}/include/ruby-1.9/" \
 			--with-rubylibprefix="${PREFIX}/lib/ruby" \
 			--docdir="${RUBY_DOCDIR}" \