Fix fts.h detection.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f232a81..1723ccd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt

@@ -120,7 +120,7 @@
 CHECK_FUNCTION_EXISTS(strtoll HAVE_STRTOLL)
 CHECK_FUNCTION_EXISTS(strtoull HAVE_STRTOULL)
 
-CHECK_INCLUDE_FILES(fts.h HAVE_FTS_H)
+CHECK_INCLUDE_FILES("sys/types.h;sys/stat.h;fts.h" HAVE_FTS_H)
 CHECK_INCLUDE_FILES(stdbool.h HAVE_STDBOOL_H)
 CHECK_INCLUDE_FILES(strings.h HAVE_STRINGS_H)
 CHECK_INCLUDE_FILES(unistd.h HAVE_UNISTD_H)