diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6f1d81947e..612de7ca48 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -490,6 +490,7 @@ if(NOT ANDROID)
 		int main(int argc, char **argv)
 		{ if(Pa_GetVersion() >= 1890) return 0; else return 1; }"
 		PORTAUDIO)
+	unset(CMAKE_REQUIRED_LIBRARIES)
 	if(PORTAUDIO)
 		message("PortAudio found, enabling mic support")
 		add_definitions(-DHAVE_PORTAUDIO=1)
diff --git a/Externals/enet/CMakeLists.txt b/Externals/enet/CMakeLists.txt
index 93d9132d16..671f59dad9 100644
--- a/Externals/enet/CMakeLists.txt
+++ b/Externals/enet/CMakeLists.txt
@@ -13,11 +13,10 @@ check_function_exists("gethostbyaddr_r" HAS_GETHOSTBYADDR_R)
 check_function_exists("inet_pton" HAS_INET_PTON)
 check_function_exists("inet_ntop" HAS_INET_NTOP)
 check_struct_has_member("struct msghdr" "msg_flags" "sys/types.h;sys/socket.h" HAS_MSGHDR_FLAGS)
-set(CMAKE_REQUIRED_LIBRARIES "")
 set(CMAKE_EXTRA_INCLUDE_FILES "sys/types.h" "sys/socket.h")
 check_type_size("socklen_t" HAS_SOCKLEN_T BUILTIN_TYPES_ONLY)
 unset(CMAKE_EXTRA_INCLUDE_FILES)
- 
+
 if(HAS_FCNTL)
     add_definitions(-DHAS_FCNTL=1)
 endif()
@@ -42,9 +41,9 @@ endif()
 if(HAS_SOCKLEN_T)
     add_definitions(-DHAS_SOCKLEN_T=1)
 endif()
- 
+
 include_directories(${PROJECT_SOURCE_DIR}/include)
- 
+
 add_library(enet STATIC
         callbacks.c
         compress.c