diff -ruwN source/src/fccache.c source-new/src/fccache.c
--- source/src/fccache.c	2019-06-10 05:36:37.000000000 -0600
+++ source-new/src/fccache.c	2019-10-02 19:48:10.459642095 -0600
@@ -1526,7 +1526,7 @@
 #if defined(_WIN32)
 	    if (_locking (fd, _LK_LOCK, 1) == -1)
 		goto bail;
-#else
+#elif !defined(__redox__)
 	    struct flock fl;
 
 	    fl.l_type = F_WRLCK;
@@ -1556,7 +1556,7 @@
     {
 #if defined(_WIN32)
 	_locking (fd, _LK_UNLCK, 1);
-#else
+#elif !defined(__redox__)
 	struct flock fl;
 
 	fl.l_type = F_UNLCK;
diff -ruwN source/src/fccharset.c source-new/src/fccharset.c
--- source/src/fccharset.c	2018-06-05 04:36:38.000000000 -0600
+++ source-new/src/fccharset.c	2019-10-02 19:48:53.082862133 -0600
@@ -600,7 +600,7 @@
 static FcChar32
 FcCharSetPopCount (FcChar32 c1)
 {
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+#if !defined(__redox__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
     return __builtin_popcount (c1);
 #else
     /* hackmem 169 */