Hi, Currently mu requires ports-clang which I think is because there was a time that GCC 4.9 didn't support C++14. Now that GCC is on 8.3, mu can be unblocked for GCC archs as well. I didn't change patch level as I think there is no visible change, but correct me if I'm wrong.
Tested on mips64el/loongson.
Index: Makefile
===================================================================
RCS file: /cvs/ports/mail/mu/Makefile,v
retrieving revision 1.18
diff -u -p -r1.18 Makefile
--- Makefile 21 Jul 2019 00:10:04 -0000 1.18
+++ Makefile 22 Jan 2020 02:16:59 -0000
@@ -14,7 +14,7 @@ PERMIT_PACKAGE= Yes
WANTLIB+= assuan c ffi gio-2.0 glib-2.0 gmime-3.0 gmodule-2.0
WANTLIB+= gobject-2.0 gpg-error gpgme gthread-2.0 iconv
-WANTLIB+= intl json-glib-1.0 m pcre pthread ${COMPILER_LIBCXX}
+WANTLIB+= intl json-glib-1.0 m pcre pthread
WANTLIB+= uuid xapian z
MASTER_SITES= https://github.com/djcb/mu/releases/download/1.2/
@@ -30,7 +30,7 @@ LIB_DEPENDS= databases/xapian-core \
# C++14 required
-COMPILER= base-clang ports-clang
+COMPILER= base-clang ports-gcc
AUTOCONF_VERSION= 2.69
AUTOMAKE_VERSION= 1.15
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