configure.ac: Use PKG_CHECK_VAR for libclc.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

diff --git a/configure.ac b/configure.ac
index 7a89344..e490195 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -2018,10 +2018,8 @@ if test "x$enable_opencl" = xyes; then
                     PKG_CONFIG_PATH environment variable.
                     By default libclc.pc is installed to /usr/local/share/pkgconfig/])
     else
-        LIBCLC_INCLUDEDIR=`$PKG_CONFIG --variable=includedir libclc`
-        LIBCLC_LIBEXECDIR=`$PKG_CONFIG --variable=libexecdir libclc`
-        AC_SUBST([LIBCLC_INCLUDEDIR])
-        AC_SUBST([LIBCLC_LIBEXECDIR])
+        PKG_CHECK_VAR([LIBCLC_INCLUDEDIR], [libclc], [includedir])
+        PKG_CHECK_VAR([LIBCLC_LIBEXECDIR], [libclc], [libexecdir])
     fi
 
     gallium_st="$gallium_st clover"