diff --git a/CMakeLists.txt b/CMakeLists.txt
index 452087fb..4938eeda 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,10 +15,12 @@ if(NOT PKG_CONFIG_FOUND)
 else(NOT PKG_CONFIG_FOUND)
     pkg_search_module(LIBCONFIGPP libconfig++)
     if(NOT LIBCONFIGPP_FOUND)
-        message(FATAL_ERROR "libconfig++ not found")
+        set(LIBCONFIG_CXXFLAGS "" CACHE STRING "libconfig++ compiler flags")
+        set(LIBCONFIG_LDFLAGS "" CACHE STRING "libconfig++ linker flags")
+    else(NOT LIBCONFIGPP_FOUND)
+        set(LIBCONFIG_CXXFLAGS ${LIBCONFIGPP_CFLAGS} CACHE STRING "libconfig++ compiler flags")
+        set(LIBCONFIG_LDFLAGS ${LIBCONFIGPP_LDFLAGS} CACHE STRING "libconfig++ linker flags")
     endif(NOT LIBCONFIGPP_FOUND)
-    set(LIBCONFIG_CXXFLAGS ${LIBCONFIGPP_CFLAGS} CACHE STRING "libconfig++ compiler flags")
-    set(LIBCONFIG_LDFLAGS ${LIBCONFIGPP_LDFLAGS} CACHE STRING "libconfig++ linker flags")
 endif(NOT PKG_CONFIG_FOUND)