diff --git a/neo/idlib/ParallelJobList_JobHeaders.h b/neo/idlib/ParallelJobList_JobHeaders.h
index 5db9e449..6b2b67a9 100644
--- a/neo/idlib/ParallelJobList_JobHeaders.h
+++ b/neo/idlib/ParallelJobList_JobHeaders.h
@@ -60,8 +60,12 @@ If you have questions concerning this license or the applicable additional terms
 #elif defined(__linux__)
 #include <malloc.h> // DG: _alloca16 needs that
 #include <signal.h>
-#endif
 // RB end
+// Yamagi begin
+#elif defined(__FreeBSD__)
+#include <signal.h>
+#endif
+// Yamagi end
 
 #ifdef _MSC_VER
 #include <intrin.h>
diff --git a/neo/idlib/sys/sys_defines.h b/neo/idlib/sys/sys_defines.h
index dd58bf4b..8dc8143d 100644
--- a/neo/idlib/sys/sys_defines.h
+++ b/neo/idlib/sys/sys_defines.h
@@ -103,7 +103,7 @@ If you have questions concerning this license or the applicable additional terms
 #endif
 
 
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__FreeBSD__)
 
 #if defined(__i386__)
 #define	CPUSTRING						"x86"
@@ -111,8 +111,13 @@ If you have questions concerning this license or the applicable additional terms
 #define CPUSTRING						"x86_86"
 #endif
 
+#ifdef __FreeBSD__
+#define	BUILD_STRING					"freebsd-" CPUSTRING
+#define BUILD_OS_ID						3
+#else
 #define	BUILD_STRING					"linux-" CPUSTRING
 #define BUILD_OS_ID						2
+#endif
 
 #define _alloca							alloca
 
diff --git a/neo/idlib/sys/sys_includes.h b/neo/idlib/sys/sys_includes.h
index 2cd9d5d1..3e9485d7 100644
--- a/neo/idlib/sys/sys_includes.h
+++ b/neo/idlib/sys/sys_includes.h
@@ -109,7 +109,7 @@ If you have questions concerning this license or the applicable additional terms
 
 #include <windows.h>						// for qgl.h
 
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__FreeBSD__)
 
 #include <signal.h>
 #include <pthread.h>