diff --git a/src/utils/byteorder.h.in b/src/utils/byteorder.h.in
index 494d537ca..e153346b7 100644
--- a/src/utils/byteorder.h.in
+++ b/src/utils/byteorder.h.in
@@ -1,3 +1,5 @@
+/* .h file GENERATED FROM byterorder.h.in */
+
 /* byteorder.h - cross-platform header for byte ordering
  *
  * Copyright (C) 2017 SINTEF Materials and Chemistry
@@ -60,10 +62,10 @@
 #cmakedefine HAVE_BSWAP_64        /* Whether function bswap_64 exists */
 #cmakedefine HAVE_BSWAP_128       /* Whether function bswap_128 exists */
 
-#cmakedefine HAVE_BYTESWAP_USHORT /* Whether function _byteswap_ushort exists */
-#cmakedefine HAVE_BYTESWAP_ULONG  /* Whether function _byteswap_ulong exists */
-#cmakedefine HAVE_BYTESWAP_UINT64 /* Whether function _byteswap_uint64 exists */
-#cmakedefine HAVE_BYTESWAP_UINT128/* Whether function _byteswap_uint128 exists*/
+#cmakedefine HAVE__BYTESWAP_USHORT /* Whether function _byteswap_ushort exists */
+#cmakedefine HAVE__BYTESWAP_ULONG  /* Whether function _byteswap_ulong exists */
+#cmakedefine HAVE__BYTESWAP_UINT64 /* Whether function _byteswap_uint64 exists */
+#cmakedefine HAVE__BYTESWAP_UINT128/* Whether function _byteswap_uint128 exists*/
 
 #cmakedefine HAVE_HTOBE16         /* Whether function htobe16 exists */
 #cmakedefine HAVE_HTOBE32         /* Whether function htobe32 exists */
@@ -74,11 +76,43 @@
 #include "integers.h"
 
 #ifdef HAVE_ENDIAN_H
-# include <endian.h>
-#endif
+  #if defined(__APPLE__) && defined(__MACH__)
+    #include <machine/endian.h>
+  #else
+    #include <endian.h>
+  #endif /* defined(__APPLE__) && defined(__MACH__) */
+#endif /* ifdef HAVE_ENDIAN_H */
 
 #ifdef HAVE_BYTESWAP_H
-# include <byteswap.h>
+  #if defined(__APPLE__) && defined(__MACH__)
+    #include <libkern/OSByteOrder.h>
+    #ifdef HAVE_BSWAP_16
+      #define bswap_16(x) OSSwapInt16(x)
+    #endif
+    #ifdef HAVE_BSWAP_32
+      #define bswap_32(x) OSSwapInt32(x)
+    #endif
+    #ifdef HAVE_BSWAP_64
+      #define bswap_64(x) OSSwapInt64(x)
+    #endif
+    #ifdef HAVE_BSWAP_128
+      #define bswap_128(x) OSSwapInt128(x)
+    #endif
+    #ifdef HAVE_HTOBE16
+      #define htobe16(x) OSSwapHostToBigInt16(x)
+    #endif
+    #ifdef HAVE_HTOBE32
+      #define htobe32(x) OSSwapHostToBigInt32(x)
+    #endif
+    #ifdef HAVE_HTOBE64
+      #define htobe64(x) OSSwapHostToBigInt64(x)
+    #endif
+    #ifdef HAVE_HTOBE128
+      #define htobe128(x) OSSwapHostToBigInt128(x)
+    #endif
+  #else
+    #include <byteswap.h>
+  #endif /* defined(__APPLE__) && defined(__MACH__) */
 #endif
 
 
@@ -161,6 +195,10 @@
 # else
 #  error "Byte order not supported: " # BYTE_ORDER
 # endif
+#elif (defined(__APPLE__) && defined(__MACH__) && defined(HAVE_HTOBE16))
+# define htole16(x) (uint16_t)(x)
+# define be16toh(x) bswap_16(x)
+# define le16toh(x) (uint16_t)(x)
 #endif
 
 #ifndef HAVE_HTOBE32
@@ -177,6 +215,10 @@
 # else
 #  error "Byte order not supported: " # BYTE_ORDER
 # endif
+#elif (defined(__APPLE__) && defined(__MACH__) && defined(HAVE_HTOBE32))
+# define htole32(x) (uint32_t)(x)
+# define be32toh(x) bswap_32(x)
+# define le32toh(x) (uint32_t)(x)
 #endif
 
 #ifndef HAVE_HTOBE64
@@ -193,6 +235,10 @@
 # else
 #  error "Byte order not supported: " # BYTE_ORDER
 # endif
+#elif (defined(__APPLE__) && defined(__MACH__) && defined(HAVE_HTOBE64))
+# define htole64(x) (uint64_t)(x)
+# define be64toh(x) bswap_64(x)
+# define le64toh(x) (uint64_t)(x)
 #endif
 
 #ifdef bswap128
@@ -210,6 +256,10 @@
 #  else
 #  error "Byte order not supported: " # BYTE_ORDER
 #  endif
+# elif (defined(__APPLE__) && defined(__MACH__) && defined(HAVE_HTOBE128))
+#  define htole128(x) (uint128_t)(x)
+#  define be128toh(x) bswap_128(x)
+#  define le128toh(x) (uint128_t)(x)
 # endif
 #endif
 
diff --git a/src/utils/compat-src/getopt.h b/src/utils/compat-src/getopt.h
index ac1f536b3..89095c226 100644
--- a/src/utils/compat-src/getopt.h
+++ b/src/utils/compat-src/getopt.h
@@ -6,8 +6,6 @@
  * Released under the MIT license
  * https://github.com/takamin/win-c/blob/master/LICENSE
  */
-#ifndef _GETOPT_H_
-#define _GETOPT_H_
 
 #ifdef __cplusplus
 extern "C" {
@@ -16,6 +14,8 @@ extern "C" {
 #ifdef HAVE_GETOPT
 #include <getopt.h>
 #else
+#ifndef _GETOPT_H_
+#define _GETOPT_H_
 
     int getopt(int argc, char* const argv[],
             const char* optstring);
diff --git a/src/utils/config.h.in b/src/utils/config.h.in
index b64d04949..0767a266a 100644
--- a/src/utils/config.h.in
+++ b/src/utils/config.h.in
@@ -79,20 +79,23 @@
 #cmakedefine HAVE_MBSTOWCS_S
 #cmakedefine HAVE_WCSTOMBS_S
 
+#cmakedefine HAVE_STRLCPY
+#cmakedefine HAVE_STRLCAT
+
 #cmakedefine HAVE_GETOPT
 #cmakedefine HAVE_GETOPT_LONG
 
-// #cmakedefine HAVE_SNPRINTF
-// #cmakedefine HAVE__SNPRINTF
-// #cmakedefine HAVE_VSNPRINTF
-// #cmakedefine HAVE__VSNPRINTF
-// #cmakedefine HAVE_VASPRINTF
-// #cmakedefine HAVE__VASPRINTF
-// #cmakedefine HAVE_ASPRINTF
-// #cmakedefine HAVE__ASPRINTF
-// #cmakedefine HAVE_LOCALECONV
-// #cmakedefine HAVE_VA_COPY
-// #cmakedefine HAVE___VA_COPY
+#cmakedefine HAVE_SNPRINTF
+#cmakedefine HAVE__SNPRINTF
+#cmakedefine HAVE_VSNPRINTF
+#cmakedefine HAVE__VSNPRINTF
+#cmakedefine HAVE_VASPRINTF
+#cmakedefine HAVE__VASPRINTF
+#cmakedefine HAVE_ASPRINTF
+#cmakedefine HAVE__ASPRINTF
+#cmakedefine HAVE_LOCALECONV
+#cmakedefine HAVE_VA_COPY
+#cmakedefine HAVE___VA_COPY
 
 #cmakedefine HAVE_MTX_INIT
 #cmakedefine HAVE_MTX_LOCK
diff --git a/src/utils/dsl.h b/src/utils/dsl.h
index 0471ba8f4..d26a4c3a2 100644
--- a/src/utils/dsl.h
+++ b/src/utils/dsl.h
@@ -49,10 +49,10 @@
 
 
 /* Determine platform */
-#if defined __APPLE__ && defined __MARCH__
+#if defined __APPLE__ && defined __MACH__
 # define DSL_PLATFORM DSL_Posix
 # ifndef DSL_PREFIX
-#  define DSL_PREFIX ""
+#  define DSL_PREFIX "lib"
 # endif
 # ifndef DSL_EXT
 #  define DSL_EXT ".dylib"
diff --git a/src/utils/fileinfo.c b/src/utils/fileinfo.c
index ec35dd001..d836f1cbb 100644
--- a/src/utils/fileinfo.c
+++ b/src/utils/fileinfo.c
@@ -12,7 +12,7 @@
 #include <errno.h>
 #include <stdio.h>
 
-#if defined(__unix__)
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
 # ifndef POSIX
 #  define POSIX
 # endif
diff --git a/src/utils/fileutils.c b/src/utils/fileutils.c
index 00dbde851..94b660050 100644
--- a/src/utils/fileutils.c
+++ b/src/utils/fileutils.c
@@ -71,11 +71,11 @@ static char *_platform_names[] = {"Native", "Unix", "Windows", "Apple", NULL};
 */
 FUPlatform fu_native_platform(void)
 {
-#if defined POSIX
+#if defined POSIX && !defined(__APPLE__)
   return fuUnix;
 #elif defined WINDOWS
   return fuWindows;
-#elif defined __APPLE__
+#elif (defined __APPLE__ && defined __MACH__)
   return fuApple;
 #else
   return fuUnknownPlatform;
@@ -91,6 +91,7 @@ int fu_supported_platform(FUPlatform platform)
   switch (platform) {
   case fuUnix:
   case fuWindows:
+  case fuApple:
     return 1;
   default:
     return 0;
@@ -127,8 +128,11 @@ const char *fu_dirsep(FUPlatform platform)
 {
   if (platform == fuNative) platform = fu_native_platform();
   switch (platform) {
-  case fuUnix: return "/";
-  case fuWindows: return "\\";
+  case fuUnix:
+  case fuApple:
+    return "/";
+  case fuWindows:
+    return "\\";
   default: return err(1, "unsupported platform: %d", platform), NULL;
   }
 }
@@ -140,8 +144,11 @@ const char *fu_pathsep(FUPlatform platform)
 {
   if (platform == fuNative) platform = fu_native_platform();
   switch (platform) {
-  case fuUnix: return ":";
-  case fuWindows: return ";";
+  case fuUnix:
+  case fuApple:
+    return ":";
+  case fuWindows:
+    return ";";
   default: return err(1, "unsupported platform: %d", platform), NULL;
   }
 }
@@ -590,6 +597,7 @@ char *fu_nativepath(const char *path, char *dest, size_t size,
 {
   switch (fu_native_platform()) {
   case fuUnix:
+  case fuApple:
     return fu_unixpath(path, dest, size, pathsep);
   case fuWindows:
     return fu_winpath(path, dest, size, pathsep);
@@ -811,7 +819,7 @@ FUPlatform fu_paths_set_platform(FUPaths *paths, FUPlatform platform)
 
   for (i=0; i < paths->n; i++) {
     const char *p = paths->paths[i];
-    if (platform == fuUnix)
+    if (platform == fuUnix || platform == fuApple)
       paths->paths[i] = fu_unixpath(p, NULL, 0, ":");
     else if (platform == fuWindows)
       paths->paths[i] = fu_winpath(p, NULL, 0, ";");
@@ -942,7 +950,10 @@ int fu_paths_insertn(FUPaths *paths, const char *path, size_t len, int n)
   if (!fu_supported_platform(platform))
     FAIL1("unsupported platform: %d", platform);
   switch (platform) {
-  case fuUnix:     p = fu_unixpath(path, NULL, 0, paths->pathsep);  break;
+  case fuUnix:
+  case fuApple:
+    p = fu_unixpath(path, NULL, 0, paths->pathsep);
+    break;
   case fuWindows:  p = fu_winpath(path, NULL, 0, paths->pathsep);   break;
   default: assert(0);  // should never happen
   }
@@ -1292,7 +1303,7 @@ FUIter *fu_pathsiter_init(const FUPaths *paths, const char *pattern)
 }
 
 /*
-  Help function for fu_paths_iter_nextfile(), which does not take `pattern`
+  Help function for fu_pathsiter_next(), which does not take `pattern`
   into account.
  */
 const char *_fu_pathsiter_next(FUIter *iter)
@@ -1394,7 +1405,7 @@ const char *fu_pathsiter_next(FUIter *iter)
 }
 
 /*
-  Deallocates iterator created with fu_paths_iter_init().
+  Deallocates iterator created with fu_pathsiter_init().
   Returns non-zero on error.
  */
 int fu_pathsiter_deinit(FUIter *iter)
diff --git a/src/utils/fileutils.h b/src/utils/fileutils.h
index 817385cde..de331de86 100644
--- a/src/utils/fileutils.h
+++ b/src/utils/fileutils.h
@@ -22,7 +22,7 @@ enum {
 };
 
 
-#if defined __unix__ || (defined __APPLE__ && defined __MARCH__)
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
 /* POSIX */
 # ifndef POSIX
 #  define POSIX
@@ -65,7 +65,7 @@ typedef enum _FUPlatform {
   fuNative=0,            /*!< Platform we are compiling on */
   fuUnix,                /*!< Unix-like platforms; POSIX complient */
   fuWindows,             /*!< Windows */
-  fuApple,               /*!< Apple - not yet supported... */
+  fuApple,               /*!< Apple */
   fuLastPlatform         /*!< Must always be the last */
 } FUPlatform;