Since building libweston includes EGL/egl.h from pixel-formats.c,
EGL_CFLAGS must be added to libweston_CFLAGS, as on some platforms that
contains -DMESA_EGL_NO_X11_HEADERS, and fails to compile without it:

  CC       libweston/libweston_3_la-pixel-formats.lo
In file included from [...]/usr/include/EGL/egl.h:39:0,
                 from libweston/pixel-formats.c:39:
[...]/usr/include/EGL/eglplatform.h:119:22:
fatal error: X11/Xlib.h: No such file or directory

Fixes: 903721a6215f ("libweston: Add pixel-format helpers")
Signed-off-by: Philipp Zabel <[email protected]>
---
 Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 94b1c143..45df7fea 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -72,7 +72,7 @@ install-libweston_moduleLTLIBRARIES 
install-moduleLTLIBRARIES: install-libLTLIBR
 lib_LTLIBRARIES = libweston-@[email protected]
 libweston_@LIBWESTON_MAJOR@_la_CPPFLAGS = $(AM_CPPFLAGS) -DIN_WESTON
 libweston_@LIBWESTON_MAJOR@_la_CFLAGS = $(AM_CFLAGS) \
-       $(COMPOSITOR_CFLAGS) $(LIBUNWIND_CFLAGS) $(LIBDRM_CFLAGS)
+       $(COMPOSITOR_CFLAGS) $(EGL_CFLAGS) $(LIBUNWIND_CFLAGS) $(LIBDRM_CFLAGS)
 libweston_@LIBWESTON_MAJOR@_la_LIBADD = $(COMPOSITOR_LIBS) $(LIBUNWIND_LIBS) \
        $(DLOPEN_LIBS) -lm $(CLOCK_GETTIME_LIBS) \
        $(LIBINPUT_BACKEND_LIBS) libshared.la
-- 
2.11.0

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