diff --git a/qse/configure b/qse/configure
index c3419361..cd4a9c4d 100755
--- a/qse/configure
+++ b/qse/configure
@@ -17382,6 +17382,18 @@ fi
 
 done
 
+for ac_header in crt_externs.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "crt_externs.h" "ac_cv_header_crt_externs_h" "$ac_includes_default"
+if test "x$ac_cv_header_crt_externs_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_CRT_EXTERNS_H 1
+_ACEOF
+
+fi
+
+done
+
 for ac_header in uci.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "uci.h" "ac_cv_header_uci_h" "$ac_includes_default"
@@ -18056,11 +18068,55 @@ if test "x$ac_cv_lib_ssl_SSL_library_init" = xyes; then :
 $as_echo "#define HAVE_SSL 1" >>confdefs.h
 
 
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ERR_get_error in -lcrypto" >&5
+$as_echo_n "checking for ERR_get_error in -lcrypto... " >&6; }
+if ${ac_cv_lib_crypto_ERR_get_error+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lcrypto  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char ERR_get_error ();
+int
+main ()
+{
+return ERR_get_error ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_crypto_ERR_get_error=yes
+else
+  ac_cv_lib_crypto_ERR_get_error=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_crypto_ERR_get_error" >&5
+$as_echo "$ac_cv_lib_crypto_ERR_get_error" >&6; }
+if test "x$ac_cv_lib_crypto_ERR_get_error" = xyes; then :
+
+			SSL_LIBS="${SSL_LIBS} -lcrypto"
+
+fi
+
+
 				$as_echo "#define HAVE_SSL_LIBRARY_INIT 1" >>confdefs.h
 
 
 fi
 
+
 fi
 
 
@@ -19732,21 +19788,36 @@ fi
 
 if test ${ac_cv_sizeof___int128_t} -gt 0
 then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking __int128_t with %" >&5
+$as_echo_n "checking __int128_t with %... " >&6; }
 	cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
 int
 main ()
 {
-__int128_t x = 0; x %= 10;
+
+			volatile __int128_t x, base;
+			x = (__int128_t)&base;
+			base = (__int128_t)&x;
+			x = x % base;
+			return (int)x;
+
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
 
+			{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
 else
-  ac_cv_sizeof___int128_t=0
+
+			{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+			ac_cv_sizeof___int128_t=0
+
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
diff --git a/qse/configure.ac b/qse/configure.ac
index 3eba9fd7..43de85a3 100644
--- a/qse/configure.ac
+++ b/qse/configure.ac
@@ -108,6 +108,7 @@ AC_CHECK_HEADERS([net/if.h net/if_dl.h], [], [], [
 	#include <sys/types.h>
 	#include <sys/socket.h>])
 AC_CHECK_HEADERS([sys/stropts.h sys/macstat.h linux/ethtool.h linux/sockios.h])
+AC_CHECK_HEADERS([crt_externs.h])
 AC_CHECK_HEADERS([uci.h])
 
 dnl check data types
@@ -235,9 +236,15 @@ else
 		SSL_LIBS="-lssl"
 		AC_DEFINE(HAVE_SSL, 1, [ssl support])
 
+		dnl additional check
+		AC_CHECK_LIB([crypto], [ERR_get_error], [
+			SSL_LIBS="${SSL_LIBS} -lcrypto"
+		])
+
 		dnl only for consistency with AC_CHECK_FUNCS
 		AC_DEFINE(HAVE_SSL_LIBRARY_INIT, 1)
 	])
+
 fi
 AC_SUBST(SSL_LIBS)
 
@@ -331,10 +338,23 @@ dnl Changing ac_cv_sizeof___int128_t here doesn't corret SIZEOF___INT128_T
 dnl since it's already generated. It only affects QSE_SIZEOF___INT128_T below.
 if test ${ac_cv_sizeof___int128_t} -gt 0
 then
+	AC_MSG_CHECKING([__int128_t with %])
 	AC_COMPILE_IFELSE(
-		[AC_LANG_PROGRAM([], [__int128_t x = 0; x %= 10;])],
-		[],
-		[ac_cv_sizeof___int128_t=0]
+		[AC_LANG_PROGRAM([], [
+			volatile __int128_t x, base;
+			x = (__int128_t)&base;
+			base = (__int128_t)&x;
+			x = x % base;
+			return (int)x;
+		])],
+
+		[
+			AC_MSG_RESULT(yes)
+		],
+		[
+			AC_MSG_RESULT(no)
+			ac_cv_sizeof___int128_t=0
+		]
 	)
 fi
 
diff --git a/qse/include/qse/config.h.in b/qse/include/qse/config.h.in
index f8dc0de0..d9c3c013 100644
--- a/qse/include/qse/config.h.in
+++ b/qse/include/qse/config.h.in
@@ -75,6 +75,9 @@
 /* Define to 1 if you have the `cosl' function. */
 #undef HAVE_COSL
 
+/* Define to 1 if you have the <crt_externs.h> header file. */
+#undef HAVE_CRT_EXTERNS_H
+
 /* Define to 1 if you have the declaration of `cygwin_conv_path', and to 0 if
    you don't. */
 #undef HAVE_DECL_CYGWIN_CONV_PATH
diff --git a/qse/include/qse/types.h b/qse/include/qse/types.h
index b580d3a5..487c7032 100644
--- a/qse/include/qse/types.h
+++ b/qse/include/qse/types.h
@@ -73,7 +73,8 @@ typedef enum qse_tri_t qse_tri_t;
 /** @typedef qse_uint_t
  * The qse_uint_t type defines an unsigned integer type as large as a pointer.
  */
-#if (defined(hpux) || defined(__hpux) || defined(__hpux__)) && \
+#if (defined(hpux) || defined(__hpux) || defined(__hpux__) || \
+     (defined(__APPLE__) && defined(__MACH__))) && \
     (QSE_SIZEOF_VOID_P == QSE_SIZEOF_LONG)
 	typedef long qse_int_t;
 	typedef unsigned long qse_uint_t;
diff --git a/qse/lib/cmn/env.c b/qse/lib/cmn/env.c
index 97c6bd44..8dccc42f 100644
--- a/qse/lib/cmn/env.c
+++ b/qse/lib/cmn/env.c
@@ -28,6 +28,11 @@
 #    include <windows.h>
 #endif
 
+#if defined(HAVE_CRT_EXTERNS_H)
+	/* MacOSX/darwin. _NSGetEnviron() */
+#	include <crt_externs.h>
+#endif
+
 #define STRSIZE 4096
 #define ARRSIZE 128
 
@@ -410,7 +415,6 @@ static qse_char_t* get_env (qse_env_t* env, const qse_char_t* name, int* free)
 
 	return QSE_NULL;
 }
-
 #elif defined(QSE_ENV_CHAR_IS_WCHAR)
 static qse_wchar_t* get_env (qse_env_t* env, const qse_wchar_t* name, int* free)
 {
@@ -470,8 +474,13 @@ static qse_wchar_t* get_env (qse_env_t* env, const qse_wchar_t* name, int* free)
 
 static qse_mchar_t* get_env (qse_env_t* env, const qse_mchar_t* name, int* free)
 {
+
+	#if defined(HAVE_CRT_EXTERNS_H)
+	qse_mchar_t** p = *(_NSGetEnviron());
+	#else
 	extern char** environ;
 	qse_mchar_t** p = environ;
+	#endif
 
 	if (p)
 	{
@@ -633,8 +642,13 @@ done:
 	return 0;
 
 #else
+
+	#if defined(HAVE_CRT_EXTERNS_H)
+	qse_mchar_t** p = *(_NSGetEnviron());
+	#else
 	extern char** environ;
 	qse_mchar_t** p = environ;
+	#endif
 
 	if (p)
 	{
diff --git a/qse/lib/cmn/pio.c b/qse/lib/cmn/pio.c
index 69e48cef..7eab3494 100644
--- a/qse/lib/cmn/pio.c
+++ b/qse/lib/cmn/pio.c
@@ -38,6 +38,9 @@
 #	if defined(HAVE_SPAWN_H)
 #		include <spawn.h>
 #	endif
+#	if defined(HAVE_CRT_EXTERNS_H)
+#		include <crt_externs.h> /* MacOSX/darwin. _NSGetEnviron() */
+#	endif
 #endif
 
 static qse_ssize_t pio_input (
@@ -445,18 +448,30 @@ int qse_pio_init (
 	posix_spawnattr_t psattr;
 	qse_pio_pid_t pid;
 	param_t param;
+	#if defined(HAVE_CRT_EXTERNS_H)
+	#define environ (*(_NSGetEnviron()))
+	#else
 	extern char** environ;
+	#endif
 #elif defined(QSE_SYSCALL0) && defined(SYS_vfork)
 	qse_pio_pid_t pid;
 	param_t param;
+	#if defined(HAVE_CRT_EXTERNS_H)
+	#define environ (*(_NSGetEnviron()))
+	#else
 	extern char** environ;
+	#endif
 	char** envarr;
 	int highest_fd;
 	int dummy;
 #else
 	qse_pio_pid_t pid;
 	param_t param;
+	#if defined(HAVE_CRT_EXTERNS_H)
+	#define environ (*(_NSGetEnviron()))
+	#else
 	extern char** environ;
+	#endif
 #endif
 
 	QSE_MEMSET (pio, 0, QSE_SIZEOF(*pio));