From 199fd8218bbcfbe8e4456fa66d66fe8efa305087 Mon Sep 17 00:00:00 2001
From: Mathis Logemann <mathisloge@gmail.com>
Date: Wed, 21 Jul 2021 20:08:22 +0200
Subject: [PATCH] this fixes a bug when including a package via pkg-config: We
 will append the call to the config file to find the package via find_package.
 However this does not work when the package was included with pkg-config

---
 cmake/MapnikFindPackage.cmake | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/cmake/MapnikFindPackage.cmake b/cmake/MapnikFindPackage.cmake
index a4a10ba7d..8bcd96216 100644
--- a/cmake/MapnikFindPackage.cmake
+++ b/cmake/MapnikFindPackage.cmake
@@ -16,10 +16,14 @@ endmacro()
 
 macro(mapnik_find_package)
     find_package(${ARGN})
-    set(MAPNIK_TMP_DEP ${ARGN})
-    list(JOIN MAPNIK_TMP_DEP " " MAPNIK_TMP_DEP)
-    list(APPEND MAPNIK_DEPENDENCIES "find_dependency(${MAPNIK_TMP_DEP})")
-    mapnik_print_version(${ARGV0})
+    if(${ARGV0}_FOUND)
+        set(MAPNIK_TMP_DEP ${ARGN})
+        list(JOIN MAPNIK_TMP_DEP " " MAPNIK_TMP_DEP)
+        list(APPEND MAPNIK_DEPENDENCIES "find_dependency(${MAPNIK_TMP_DEP})")
+        mapnik_print_version(${ARGV0})
+    else()
+        message(STATUS "not found: ${ARGV0}")
+    endif()
 endmacro()
 
 macro(mapnik_find_threads)