diff --git a/init_lib.c b/init_lib.c
index 0479af4..a6461bb 100644
--- a/init_lib.c
+++ b/init_lib.c
@@ -47,6 +47,10 @@
 #include <fcntl.h>
 #include <string.h>
 
+#ifdef __FreeBSD__
+#include <machine/param.h>
+#endif
+
 void
 vmem_heap_init(void)
 {
@@ -84,8 +88,10 @@ umem_type_init(caddr_t start, size_t len, size_t pgsize)
 	SYSTEM_INFO info;
 	GetSystemInfo(&info);
 	pagesize = info.dwPageSize;
-#else
+#elseif !defined(__FreeBSD__)
 	pagesize = _sysconf(_SC_PAGESIZE);
+#else
+	pagesize = PAGE_SIZE;
 #endif
 }
 
diff --git a/malloc.c b/malloc.c
index e107858..45fae6e 100644
--- a/malloc.c
+++ b/malloc.c
@@ -33,7 +33,9 @@
 
 #include <string.h>
 
+#ifdef HAVE_SYS_SYSMACROS_H
 #include <sys/sysmacros.h>
+#endif
 
 #include "umem_base.h"
 
diff --git a/sol_compat.h b/sol_compat.h
index 6b670ce..e0b8c4c 100644
--- a/sol_compat.h
+++ b/sol_compat.h
@@ -165,7 +165,7 @@ static INLINE uint_t ec_atomic_inc(uint_t *mem)
 
 #ifdef _WIN32
 #define issetugid()		  0
-#else
+#elseif !defined(__FreeBSD__)
 #define issetugid()       (geteuid() == 0)
 #endif
 
diff --git a/umem.c b/umem.c
index 7dbcff1..54d6f51 100644
--- a/umem.c
+++ b/umem.c
@@ -518,7 +518,7 @@ umem_log_header_t *umem_failure_log;
 umem_log_header_t *umem_slab_log;
 
 extern thread_t _thr_self(void);
-#if defined(__MACH__)
+#if defined(__MACH__) || defined(__FreeBSD__)
 # define CPUHINT()	((int)(_thr_self()))
 #endif