imake is failing with clang

Submitted by Sylvestre Ledru

Assigned to Jeremy Huddleston Sequoia

Link to original bug (#45509)

Description

imake is failing if the C compiler used is clang.

The error is the following:

make[1]: Entering directory `/build/9menu-iFFdHM/9menu-1.8'
xmkmf
imake -DUseInstalled -I/usr/lib/X11/config
In file included from Imakefile.c:34:
In file included from /usr/lib/X11/config/Imake.tmpl:316:
/usr/lib/X11/config/Imake.rules:1674:27: error: empty character constant
        for flag in ${MAKEFLAGS} ''; do \                               @@\
                                 ^
In file included from Imakefile.c:34:
/usr/lib/X11/config/Imake.tmpl:2243:10: fatal error: ' X11 .rules' file not found
#include ProjectRulesFile
         ^
/usr/lib/X11/config/Imake.tmpl:2241:35: note: expanded from:
# define ProjectRulesFile       Concat3(<,TopLevelProject,.rules>)
                                        ^
/usr/lib/X11/config/Imake.rules:256:23: note: expanded from:
#define Concat3(a,b,c)a/**/b/**/c
                      ^
2 errors generated.

I am available for testing any chances.