--- arx-libertatis-1.1.2/CMakeLists.txt.orig	2019-08-18 13:25:08.751849259 +0200
+++ arx-libertatis-1.1.2/CMakeLists.txt	2019-08-18 13:25:59.639195213 +0200
@@ -402,7 +402,7 @@
 	# Define _POSIX_C_SOURCE and _XOPEN_SOURCE for GNU systems
 	if(${CMAKE_SYSTEM_NAME} MATCHES "Linux" OR ${CMAKE_SYSTEM_NAME} MATCHES "GNU"
 	   OR ${CMAKE_SYSTEM_NAME} MATCHES "kFreeBSD")
-		set(CMAKE_REQUIRED_DEFINITIONS "-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=600")
+		set(CMAKE_REQUIRED_DEFINITIONS -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=600)
 		add_definitions(-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=600)
 		if(${CMAKE_SYSTEM_NAME} MATCHES "kFreeBSD")
 			set(CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} -D_BSD_SOURCE")