[PATCH weston] configure.ac: add explicit enable/disable for lcms

[Jussi Kukkonen]

This is useful for reproducable builds.

Signed-off-by: Jussi Kukkonen <jussi.kukkonen at intel.com>
---

This was originally sent by Tim Orling on May 2014. I've moved the
AM_CONDITIONAL below the test as requested in Kristians review.
He also said AM_CONDITIONAL needs to key off have_lcms but I believe
that would break "--disable-lcms" when lcms2-dev is present so did
not include that change: I think this version works for all cases.

Have a nice weekend everyone,
  Jussi


 configure.ac | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 23b0790..bba8050 100644
--- a/configure.ac
+++ b/configure.ac
@@ -577,12 +577,24 @@ AC_ARG_ENABLE(demo-clients-install,
 			     enable_demo_clients_install=no)
 AM_CONDITIONAL(INSTALL_DEMO_CLIENTS, [test "x$enable_demo_clients_install" = "xyes"])
 
-PKG_CHECK_MODULES(LCMS, lcms2,
-                  [have_lcms=yes], [have_lcms=no])
-if test "x$have_lcms" = xyes; then
-       AC_DEFINE(HAVE_LCMS, 1, [Have lcms support])
+AC_ARG_ENABLE(lcms,
+              AS_HELP_STRING([--disable-lcms],
+                             [Disable lcms support]),,
+              enable_lcms=auto)
+if test "x$enable_lcms" != "xno"; then
+        PKG_CHECK_MODULES(LCMS,
+                          lcms2,
+                          have_lcms=yes,
+                          have_lcms=no)
+        if test "x$have_lcms" = "xno" -a "x$enable_lcms" = "xyes"; then
+          AC_MSG_ERROR([lcms support explicitly requested, but lcms couldn't be found])
+        fi
+        if test "x$have_lcms" = "xyes"; then
+                enable_lcms=yes
+                AC_DEFINE(HAVE_LCMS, 1, [Have lcms support])
+        fi
 fi
-AM_CONDITIONAL(HAVE_LCMS, [test "x$have_lcms" = xyes])
+AM_CONDITIONAL(HAVE_LCMS, [test "x$enable_lcms" = xyes])
 
 AC_PATH_PROG([wayland_scanner], [wayland-scanner])
 if test x$wayland_scanner = x; then
-- 
2.6.2