@@ -, +, @@ 
    build: Fix build with CONFIG_SHELL=/bin/dash.
--- a/configure.ac	
+++ a/configure.ac	
@@ -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