--- rpl/Attic/configure.in	2011/09/16 14:42:02	1.84
+++ rpl/Attic/configure.in	2011/09/16 16:37:07	1.85
@@ -205,13 +205,48 @@ fi],[
 )
 
 AC_ARG_ENABLE(sysv-semaphores,
-[  --enable-sysv-ipcs      use SystemV IPC functions [[default=no]]], [
+[  --enable-sysv-ipcs      use SystemV IPC functions [[default=guessed]]], [
 if test "$enableval" = "no"; then
 	IPCS_SYSV=no
 else
 	IPCS_SYSV=yes
 fi],
-IPCS_SYSV=no)
+[AC_MSG_CHECKING([for POSIX semaphores])
+AC_COMPILE_IFELSE(
+[AC_LANG_PROGRAM([#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>],
+[ int fd; char *sem = "/sem.test";
+fd = shm_open(sem , O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
+  close(fd);
+  shm_unlink(sem);
+  return(0);
+])],
+[IPCS_SYSV=-UIPCS_SYSV; AC_MSG_RESULT(yes)],
+[IPCS_SYSV=-DIPCS_SYSV; AC_MSG_RESULT(no)]
+	)]
+)
+
+if test "$IPCS_SYSV" = "-UIPCS_SYSV"; then
+REG=$LDFLAGS
+LDFLAGS=-pthread
+AC_MSG_CHECKING([for POSIX anonymous semaphores])
+AC_RUN_IFELSE(
+[AC_LANG_PROGRAM([#include <semaphore.h>
+ ],
+[ sem_t sem;
+ if (sem_init(&sem, 1, 0) != 0) return(1);
+ sem_destroy(&sem);
+  return(0);
+])],
+[SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES; AC_MSG_RESULT(yes)],
+[SEMAPHORES_NOMMES=-DSEMAPHORES_NOMMES; AC_MSG_RESULT(no)],
+	)]
+LDFLAGS=$REG
+REG=""
+else
+	SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
+fi
 
 AC_ARG_ENABLE(full-static,
 [  --enable-full-static    build static RPL/2 engine [[default=shared]]], [
@@ -1026,8 +1061,6 @@ case $OS in
     Darwin)
 		EXPORT_DYNAMIC=-Wl,-flat_namespace
 		NESTED_FUNCTIONS=-fnested-functions
-		SEMAPHORES_NOMMES=-DSEMAPHORES_NOMMES
-		IPCS_SYSV=-UIPCS_SYSV
 		CXXFLAGS="$CXXFLAGS -D_GLIBCXX_FULLY_DYNAMIC_STRING"
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
@@ -1041,8 +1074,6 @@ case $OS in
     Cygwin)
 		EXPORT_DYNAMIC=-Wl,--export-all-symbols
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-		IPCS_SYSV=-UIPCS_SYSV
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
 				CFLAGS=\"$CFLAGS\" CXXFLAGS=\"$CXXFLAGS\" \
@@ -1055,8 +1086,6 @@ case $OS in
 	Interix)
 		EXPORT_DYNAMIC=-Wl,--export-all-symbols
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-		IPCS_SYSV=-UIPCS_SYSV
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
 				CFLAGS=\"$CFLAGS\" CXXFLAGS=\"$CXXFLAGS\" \
@@ -1069,8 +1098,6 @@ case $OS in
     AIX)
 		EXPORT_DYNAMIC=-Wl,--export-dynamic
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-DSEMAPHORES_NOMMES
-		IPCS_SYSV=-UIPCS_SYSV
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
 				CFLAGS=\"$CFLAGS\" CXXFLAGS=\"$CXXFLAGS\" \
@@ -1087,8 +1114,6 @@ case $OS in
 		OS=OS2
 		NESTED_FUNCTIONS=
 		EXPORT_DYNAMIC=-Zmap
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-		IPCS_SYSV=-DIPCS_SYSV
 		ac_configure_args="$ac_configure_args --without-readline \
 				--without-cairo --disable-shared --enable-static \
 				--enable-threads \
@@ -1105,8 +1130,6 @@ case $OS in
 		fi;
 		EXPORT_DYNAMIC=-Wl,--export-dynamic
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-		IPCS_SYSV=-DIPCS_SYSV
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
 				CFLAGS=\"$CFLAGS\" CXXFLAGS=\"$CXXFLAGS\" \
@@ -1119,13 +1142,6 @@ case $OS in
     SunOS)
 		EXPORT_DYNAMIC=-Wl,--export-dynamic
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-
-		if test $IPCS_SYSV = no; then
-			IPCS_SYSV=-UIPCS_SYSV
-		else
-			IPCS_SYSV=-DIPCS_SYSV
-		fi
 
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
@@ -1140,13 +1156,6 @@ case $OS in
     NetBSD)
 		EXPORT_DYNAMIC=-Wl,--export-dynamic
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-
-		if test $IPCS_SYSV = no; then
-			IPCS_SYSV=-UIPCS_SYSV
-		else
-			IPCS_SYSV=-DIPCS_SYSV
-		fi
 
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \
@@ -1162,13 +1171,6 @@ case $OS in
     *)
 		EXPORT_DYNAMIC=-Wl,--export-dynamic
 		NESTED_FUNCTIONS=
-		SEMAPHORES_NOMMES=-USEMAPHORES_NOMMES
-
-		if test $IPCS_SYSV = no; then
-			IPCS_SYSV=-UIPCS_SYSV
-		else
-			IPCS_SYSV=-DIPCS_SYSV
-		fi
 
 		ac_configure_args="$ac_configure_args --with-readline=builtin \
 				--disable-shared --enable-static --enable-threads \