Check for argp library before depending on it.

Signed-off-by: Guido Falsi <madpilot@freebsd.org>

diff --git a/src/csync/ConfigureChecks.cmake b/src/csync/ConfigureChecks.cmake
index 755f21c9b2848ca0ed7a43f78d8a8661f08eafb1..64bdf1770ee6f42129ad41daf3bad81e76b8175d 100644 (file)
--- a/src/csync/ConfigureChecks.cmake
+++ b/src/csync/ConfigureChecks.cmake
@@ -24,7 +24,8 @@ if (NOT LINUX)
     set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} )
 
     # Systems not using glibc require linker flag for argp
-    if(HAVE_ARGP_H)
+    check_library_exists(argp argp_parse "" HAVE_LIBARGP)
+    if(HAVE_ARGP_H AND HAVE_LIBARGP)
         set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} argp)
     endif()
 endif (NOT LINUX)