diff --git a/grive/CMakeLists.txt b/grive/CMakeLists.txt
index 837a36d..37145f1 100644
--- a/grive/CMakeLists.txt
+++ b/grive/CMakeLists.txt
@@ -26,4 +26,9 @@ set_target_properties( grive_executable
 )
 
 install(TARGETS grive_executable RUNTIME DESTINATION bin)
-install(FILES doc/grive.1 DESTINATION share/man/man1 )
+
+if ( ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD" )
+    install(FILES doc/grive.1 DESTINATION man/man1 )
+else ( ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD" )
+    install(FILES doc/grive.1 DESTINATION share/man/man1 )
+endif( ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD" )
diff --git a/libgrive/src/util/File.cc b/libgrive/src/util/File.cc
index 375cd62..93345ac 100644
--- a/libgrive/src/util/File.cc
+++ b/libgrive/src/util/File.cc
@@ -33,6 +33,10 @@
 #include <sys/types.h>
 #include <fcntl.h>
 
+#ifdef __OpenBSD__
+#include <unistd.h>
+#endif
+
 #ifdef WIN32
 	#include <io.h>
 	typedef int ssize_t ;