https://bugs.gentoo.org/777087
https://bugs.launchpad.net/libindicator/+bug/1502925
Thanks-to: orbea <orbea@riseup.net>
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,7 @@ AM_INIT_AUTOMAKE([1.11 -Wall tar-pax])
 
 AM_MAINTAINER_MODE([enable])
 
-AM_SILENT_RULES([yes])]
+AM_SILENT_RULES([yes])
 
 # Check for programs
 AC_PROG_CC
@@ -66,7 +66,7 @@ AS_IF([test "x$with_gtk" = x3],
 AM_CONDITIONAL(USE_GTK3, [test "x$with_gtk" = x3])
 
 LT_LIB_M
-LIBINDICATOR_LIBS+="$LIBM"
+LIBINDICATOR_LIBS="${LIBINDICATOR_LIBS} $LIBM"
 
 ##############################
 # Custom Junk