From 006ef4951ebce8f9fcd1432991ff33f4f138e718 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 27 May 2018 22:38:14 +0200
Subject: cmake/pkg-config: print informative message

---
 cmake/opentrack-pkg-config.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/opentrack-pkg-config.cmake b/cmake/opentrack-pkg-config.cmake
index e9136563..218bba6e 100644
--- a/cmake/opentrack-pkg-config.cmake
+++ b/cmake/opentrack-pkg-config.cmake
@@ -6,11 +6,13 @@ function(otr_pkgconfig target)
     set(ldflags "")
     foreach(i ${ARGN})
         set(k pkg-config_${i})
-        pkg_check_modules(${k} REQUIRED QUIET ${i})
+        pkg_check_modules(${k} QUIET ${i})
         if(${${k}_FOUND})
             set(cflags "${cflags} ${${k}_CFLAGS} ")
             set(includes ${includes} ${${k}_INCLUDE_DIRS} ${${k}_INCLUDEDIR})
             set(ldflags "${ldflags} ${${k}_LDFLAGS} ")
+        else()
+            message(FATAL_ERROR "Can't find '${i}'. Please install development files for this package.")
         endif()
     endforeach()
     #message(STATUS "foo | ${cflags} | ${includes} | ${ldflags}")
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