diff --git a/CMakeLists.txt b/CMakeLists.txt
index f52d6760..b850b266 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -161,7 +161,7 @@ if(FFTW)
 			add_definitions(-DPIP_FFTW_THREADSAFE)
 			list(APPEND LIBS fftw3_threads fftw3f_threads)
 		else()
-			message(WARNING "Building fftw3 without threadsafe")
+			message(WARNING "WARNING PIFFTW::preparePlan was not threadsafe")
 		endif()
 	endif()
 else()
diff --git a/src/system/piprocess.cpp b/src/system/piprocess.cpp
index ca3a1752..b9edb5c9 100755
--- a/src/system/piprocess.cpp
+++ b/src/system/piprocess.cpp
@@ -22,12 +22,15 @@
 # include <winbase.h>
 #else
 #  include <sys/wait.h>
+#  include <sys/types>
 #  include <csignal>
 #endif
 #ifdef MAC_OS
 #  include <crt_externs.h>
 #endif
-
+#ifdef CC_GCC
+#  include <unistd.h>
+#endif
 
 PIProcess::PIProcess(): PIThread() {
 	exit_code = -1;