libpayload: Add PDCurses and ncurses' libform/libmenu

PDCurses provides an alternative implementation of the curses library
standard in addition to tinycurses.
Where tinycurses is really tiny, PDCurses is more complete and provides
virtually unlimited windows and the full API.
The PDCurses code is brought in "vanilla", with all local changes
residing in curses/pdcurses-backend/

In addition to a curses library, this change also provides libpanel (as
part of the PDCurses code), and libform and libmenu which were derived
from ncurses-5.9.
As they rely on ncurses internals (and PDCurses is not ncurses), more
changes were required for these libraries to work.

The build system is extended to install the right set of header files
depending on the selected curses implementation.

Change-Id: I9e5b920f94b6510da01da2f656196a993170d1c5
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/106
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>

1 files changed, 613 insertions, 0 deletions

diff --git a/payloads/libpayload/curses/PDCurses-3.4/aclocal.m4 b/payloads/libpayload/curses/PDCurses-3.4/aclocal.m4
new file mode 100644
index 0000000000..ad7c3f3a44
--- /dev/null
+++ b/payloads/libpayload/curses/PDCurses-3.4/aclocal.m4
@@ -0,0 +1,613 @@
+dnl ---------------------------------------------------------------------------
+dnl This file offers the following macros...
+dnl ---------------------------------------------------------------------------
+dnl MH_IPC
+dnl MH_CHECK_X_INC
+dnl MH_CHECK_X_LIB
+dnl MH_CHECK_X_HEADERS
+dnl MH_CHECK_X_KEYDEFS
+dnl MH_CHECK_X_TYPEDEF
+dnl MH_CHECK_LIB
+dnl MH_SHARED_LIBRARY
+dnl MH_HOWTO_DYN_LINK
+dnl MH_CHECK_CC_O
+dnl MH_SHLPST
+dnl MH_CHECK_MAX_SIGNALS
+
+dnl ---------------------------------------------------------------------------
+dnl Determine if the system has System V IPC. ie sys/ipc.h and sys/shm.h
+dnl headers.
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_IPC],
+[
+AC_CHECK_HEADER(sys/ipc.h)
+if test $ac_cv_header_sys_ipc_h = no; then
+	AC_MSG_ERROR(Cannot find required header file sys/ipc.h; PDCurses cannot be configured)
+fi
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Set up the correct X header file location
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_X_INC],
+[
+mh_x11_dir=""
+mh_x11_xaw_dir=""
+
+mh_inc_dirs="$ac_x_header_dirs"
+
+dnl Provide for user supplying directory
+
+if test "x$x_includes" != xNONE ; then
+	mh_inc_dirs="$x_includes $mh_inc_dirs"
+fi
+
+dnl Try to determine the directory containing X headers
+dnl We will append X11 to all the paths above as an extra check
+
+for ac_dir in $mh_inc_dirs ; do
+  if test -r $ac_dir/Intrinsic.h; then
+    mh_x11_dir=$ac_dir
+    break
+  fi
+  if test -r $ac_dir/X11/Intrinsic.h; then
+    mh_x11_dir="$ac_dir/X11"
+    break
+  fi
+done
+
+dnl Try to determine the directory containing Xaw headers
+dnl We will append X11 to all the paths above as an extra check
+
+if test "$with_xaw3d" = yes; then
+	mh_xaw_dir="Xaw3d"
+else
+	if test "$with_nextaw" = yes; then
+		mh_xaw_dir="neXtaw"
+	else
+		mh_xaw_dir="Xaw"
+	fi
+fi
+for ac_dir in $mh_inc_dirs ; do
+  if test -r $ac_dir/$mh_xaw_dir/Box.h; then
+    mh_x11_xaw_dir=$ac_dir
+    break
+  fi
+  if test -r $ac_dir/X11/$mh_xaw_dir/Box.h; then
+    mh_x11_xaw_dir="$ac_dir/X11"
+    break
+  fi
+done
+
+if test "x$mh_x11_dir" != "x" ; then
+	mh_x11_dir_no_x11=`echo $mh_x11_dir | sed 's/\/X11$//'`
+
+	if test "$mh_x11_dir_no_x11" != "$mh_x11_dir" ; then
+		MH_XINC_DIR="-I$mh_x11_dir -I$mh_x11_dir_no_x11"
+	else
+		MH_XINC_DIR="-I$mh_x11_dir"
+	fi
+else
+	AC_MSG_ERROR(Cannot find required header file Intrinsic.h; PDCurses cannot be configured)
+fi
+
+if test "x$mh_x11_xaw_dir" != "x"; then
+	if test "$mh_x11_xaw_dir" != "$mh_x11_dir" ; then
+		MH_XINC_DIR="-I$mh_x11_xaw_dir $MH_XINC_DIR"
+	fi
+else
+	AC_MSG_ERROR(Cannot find required Xaw header file Box.h; PDCurses cannot be configured)
+fi
+
+AC_SUBST(MH_XINC_DIR)
+
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Set up the correct X library file location
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_X_LIB],
+[
+dnl Some systems require extra libraries...
+
+mh_solaris_flag=no
+mh_hpux9_flag=no
+AC_REQUIRE([AC_CANONICAL_SYSTEM])
+case "$target" in
+	*solaris*)
+		mh_solaris_flag=yes
+		;;
+	*pc-sco*)
+		extra_x_libs="Xext"
+		;;
+	sparc*sunos*)
+		extra_x_libs="Xext"
+		if test "$ac_cv_prog_CC" = "gcc" ; then
+			extra_ld_flags="-Wl,-Bstatic"
+			extra_ld_flags2="-Wl,-Bdynamic"
+		else
+			extra_ld_flags="-Bstatic"
+			extra_ld_flags2="-Bdynamic"
+		fi
+		;;
+	*hpux9*)
+		mh_hpux9_flag=yes
+		;;
+esac
+
+if test "$with_xaw3d" = yes; then
+	MH_X11_LIBS="Xaw3d Xmu Xt X11"
+else
+	if test "$with_nextaw" = yes; then
+		MH_X11_LIBS="neXtaw Xmu Xt X11"
+	else
+		MH_X11_LIBS="Xaw Xmu Xt X11"
+	fi
+fi
+MH_X11R6_LIBS="SM ICE Xext"
+mh_x11r6=no
+
+mh_lib_dirs="$x_libraries `echo "$ac_x_includes $ac_x_header_dirs" | sed s/include/lib/g`"
+
+dnl try to find libSM.[a,sl,so,dylib]. If we find it we are using X11R6
+for ac_dir in $mh_lib_dirs ; do
+	for mh_xsm in libSM.a libSM.so libSM.sl libSM.dylib; do
+	  if test -r $ac_dir/$mh_xsm; then
+	    mh_x11r6=yes
+	    break 2
+	  fi
+	done
+done
+
+if test "$mh_x11r6" = yes ; then
+	mh_libs="$MH_X11_LIBS $MH_X11R6_LIBS"
+else
+	mh_libs="$MH_X11_LIBS $extra_x_libs"
+fi
+
+
+dnl Ensure that all required X libraries are found
+
+mh_prev_dir=""
+mh_where_found=""
+mh_where_found_dirs=""
+mh_solaris_path=""
+for mh_lib in $mh_libs; do
+  mh_lib_found=no
+  for ac_dir in $mh_lib_dirs ; do
+    for mh_ext in a so sl dll.a dylib; do
+      if test -r $ac_dir/lib$mh_lib.$mh_ext; then
+        if test "x$mh_prev_dir" != "x$ac_dir" ; then
+          if test "x$mh_prev_dir" = "x" ; then
+             mh_where_found="$mh_where_found found in $ac_dir"
+          else
+             mh_where_found="$mh_where_found and in $ac_dir"
+          fi
+          mh_prev_dir=$ac_dir
+          mh_where_found_dirs="$mh_where_found_dirs $ac_dir"
+          MH_XLIBS="$MH_XLIBS -L$ac_dir"
+          mh_solaris_path="${mh_solaris_path}:$ac_dir"
+        fi
+        MH_XLIBS="$MH_XLIBS -l$mh_lib"
+        mh_lib_found=yes
+        break 2
+      fi
+    done
+  done
+  if test "$mh_lib_found" = no; then
+    AC_MSG_ERROR(Cannot find required X library; lib$mh_lib. PDCurses cannot be configured)
+  fi
+done
+
+mh_solaris_path=`echo $mh_solaris_path | sed 's/^://'`
+if test "$mh_solaris_flag" = yes ; then
+	MH_XLIBS="-R$mh_solaris_path $extra_ld_flags $MH_XLIBS $extra_libs $extra_ld_flags2"
+else
+	MH_XLIBS="$extra_ld_flags $MH_XLIBS $extra_libs $extra_ld_flags2"
+fi
+if test "$mh_hpux9_flag" = yes ; then
+  grep -q XtSetLanguageProc $mh_x11_dir/Intrinsic.h
+  if test $? -eq 0 ; then
+    mh_found_xtshellstrings=no
+    for mh_acdir in $mh_where_found_dirs ; do
+      for mh_xaw in `ls $mh_acdir/libXaw.*` ; do
+        nm $mh_xaw | grep XtShellStrings | grep -qv extern
+        if test $? -eq 0 ; then
+          mh_found_xtshellstrings=yes
+        fi
+      done
+    done
+    if test "$mh_found_xtshellstrings" = no ; then
+      AC_MSG_WARN(The X11 development environment has not been installed correctly.)
+      AC_MSG_WARN(The header file; Intrinsic.h, is for X11R5 while the Athena Widget)
+      AC_MSG_WARN(Set library; libXaw is for X11R4.  This is a common problem with)
+      AC_MSG_WARN(HP-UX 9.x.)
+      AC_MSG_ERROR(X11 installation incomplete; cannot continue)
+    fi
+  fi
+fi
+
+AC_SUBST(MH_XLIBS)
+
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Determine if the supplied X headers exist.
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_X_HEADERS],
+[
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS $MH_XINC_DIR"
+for mh_header in $1; do
+	AC_CHECK_HEADERS($mh_header)
+done
+CPPFLAGS="$save_CPPFLAGS"
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Determine if various key definitions exist in keysym.h
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_X_KEYDEFS],
+[
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS $MH_XINC_DIR"
+for mh_keydef in $1; do
+	AC_MSG_CHECKING(for $mh_keydef in keysym.h)
+	mh_upper_name="HAVE_`echo $mh_keydef | tr '[a-z]' '[A-Z]'`"
+	AC_TRY_COMPILE([#include <keysym.h>],
+[int i = $mh_keydef;],
+  mh_have_key=yes; AC_DEFINE_UNQUOTED($mh_upper_name,1), mh_have_key=no )
+	AC_MSG_RESULT($mh_have_key)
+done
+CPPFLAGS="$save_CPPFLAGS"
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Determine if supplied types have been typedefed
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_X_TYPEDEF],
+[
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS $SYS_DEFS $MH_XINC_DIR"
+for td in $1 ; do
+AC_MSG_CHECKING(if $td is typedefed:)
+AC_TRY_COMPILE(
+[#include "X11/Xlib.h"],
+[$td fred],
+	[mh_td=yes],
+	[mh_td=no]
+)
+if test "$mh_td" = yes ; then
+	TD_upper=`echo $td | tr a-z A-Z`
+	AC_DEFINE_UNQUOTED(${TD_upper}_TYPEDEFED, 1)
+fi
+AC_MSG_RESULT($mh_td)
+done
+CPPFLAGS="$save_CPPFLAGS"
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Check for presence of various libraries
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_LIB],
+[
+MH_EXTRA_LIBS=''
+for mh_lib in $1; do
+	if test "$on_qnx" = yes; then
+		AC_MSG_CHECKING(for library -l${mh_lib})
+		if test -r /usr/lib/${mh_lib}3r.lib; then
+			AC_MSG_RESULT(found)
+			MH_EXTRA_LIBS="${MH_EXTRA_LIBS} -l${mh_lib}"
+		else
+		AC_MSG_RESULT(not found)
+		fi
+	else
+		AC_CHECK_LIB($mh_lib,main,mh_lib_found=yes,mh_lib_found=no)
+		if test "$mh_lib_found" = yes; then
+			MH_EXTRA_LIBS="${MH_EXTRA_LIBS} -l${mh_lib}"
+		fi
+	fi
+done
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Work out how to create a dynamically loaded module
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_HOWTO_DYN_LINK],
+[
+mh_compile='${CC-cc} -c $DYN_COMP conftest.$ac_ext 1>&AC_FD_CC'
+cat > conftest.$ac_ext <<EOF
+dnl [#]line __oline__ "[$]0"
+[#]line __oline__ "configure"
+int foo()
+{
+return(0);
+}
+EOF
+if AC_TRY_EVAL(mh_compile) && test -s conftest.o; then
+	mh_dyn_link='ld -shared -o conftest.rxlib conftest.o -lc 1>&AC_FD_CC'
+#	mh_dyn_link='${CC} -Wl,-shared -o conftest.rxlib conftest.o -lc 1>&AC_FD_CC'
+	if AC_TRY_EVAL(mh_dyn_link) && test -s conftest.rxlib; then
+		LD_RXLIB1="ld -shared"
+#		LD_RXLIB1="${CC} -Wl,-shared"
+		SHLPRE="lib"
+		SHLPST=".so"
+	else
+		mh_dyn_link='ld -G -o conftest.rxlib conftest.o 1>&AC_FD_CC'
+#		mh_dyn_link='${CC} -Wl,-G -o conftest.rxlib conftest.o 1>&AC_FD_CC'
+		if AC_TRY_EVAL(mh_dyn_link) && test -s conftest.rxlib; then
+			LD_RXLIB1="ld -G"
+#			LD_RXLIB1="${CC} -Wl,-G"
+			SHLPRE="lib"
+			SHLPST=".so"
+		else
+			LD_RXLIB1=""
+			SHLPRE=""
+			SHLPST=""
+		fi
+	fi
+fi
+rm -f conftest*
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Determine how to build shared libraries etc..
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_SHARED_LIBRARY],
+[
+AC_REQUIRE([MH_SHLPST])
+dnl
+dnl If compiler is gcc, then flags should be the same for all platforms
+dnl (just guessing on this)
+dnl
+AIX_DYN="no"
+BEOS_DYN="no"
+SHLFILE="$1"
+SHLFILES="$*"
+RXPACKEXPORTS=""
+SHLPRE="lib"
+LD_RXLIB1=""
+
+AC_REQUIRE([AC_CANONICAL_SYSTEM])
+case "$target" in
+	*hp-hpux*)
+		SYS_DEFS="-D_HPUX_SOURCE"
+		LD_RXLIB1="ld -b -q -n"
+		;;
+	*ibm-aix*)
+		SYS_DEFS="-D_ALL_SOURCE -DAIX"
+		AIX_DYN="yes"
+		DYN_COMP="-DDYNAMIC"
+		LD_RXLIB1="ld -bnoentry -bM:SRE"
+		RXPACKEXPORTS="-bE:$SHLFILE.exp"
+		RXPACKEXP="$SHLFILE.exp"
+		;;
+	*dec-osf*)
+		if test "$ac_cv_prog_CC" = "gcc"; then
+			SYS_DEFS="-D_POSIX_SOURCE -D_XOPEN_SOURCE"
+		else
+			SYS_DEFS="-D_POSIX_SOURCE -D_XOPEN_SOURCE -Olimit 800"
+		fi
+		LD_RXLIB1="ld -shared"
+		;;
+	*sequent-dynix*|*esix*|*dgux*)
+		LD_RXLIB1="ld -G"
+		;;
+	*solaris*)
+		if test "$ac_cv_prog_CC" = "gcc"; then
+			LD_RXLIB1="gcc -shared"
+		else
+			LD_RXLIB1="ld -G"
+		fi
+		;;
+	sparc*sunos*)
+		SYS_DEFS="-DSUNOS -DSUNOS_STRTOD_BUG"
+		LD_RXLIB1="ld"
+		;;
+	*linux*|*atheos*|*nto-qnx*)
+		LD_RXLIB1="${CC} -shared"
+		;;
+	*freebsd*)
+		LD_RXLIB1="ld -Bdynamic -Bshareable"
+		;;
+	*pc-sco*)
+		LD_RXLIB1="ld -dy -G"
+		;;
+	*beos*)
+		LD_RXLIB1="${CC} -Wl,-shared -nostart -Xlinker -soname=\$(@)"
+		BEOS_DYN="yes"
+		;;
+	*qnx*)
+		SHLPRE=""
+		DYN_COMP="-Q"   # force no check for dynamic loading
+		SHLFILE=""
+		;;
+	*cygwin)
+		SHLPRE=""
+		DYN_COMP="-DDYNAMIC"
+		LD_RXLIB1="dllwrap --def \$(srcdir)/../win32/pdcurses.def --target i386-cygwin32 --dllname \$(@)"
+# cygwininstall target MUST install the shared library itself because
+# it puts it into $(bindir) not $(libdir) as all other platforms
+		;;
+	*darwin*)
+		DYN_COMP="-fno-common"
+		LD_RXLIB1="${CC} -flat_namespace -undefined suppress -dynamiclib -install_name=\$(@)"
+		;;
+	*)
+		;;
+esac
+
+dnl determine what switches our compiler uses for building objects
+dnl suitable for inclusion in shared libraries
+dnl Only call this if DYN_COMP is not set. If we have set DYN_COMP
+dnl above, then we know how to compile AND link for dynamic libraries
+
+if test "$DYN_COMP" = ""; then
+AC_MSG_CHECKING(compiler flags for a dynamic object)
+
+cat > conftest.$ac_ext <<EOF
+dnl [#]line __oline__ "[$]0"
+[#]line __oline__ "configure"
+int a=0
+EOF
+
+	DYN_COMP=""
+	mh_cv_stop=no
+	save_cflags="$CFLAGS"
+	mh_cv_flags="-fPIC -KPIC +Z"
+	for a in $mh_cv_flags; do
+		CFLAGS="-c $a"
+
+		mh_compile='${CC-cc} -c $CFLAGS conftest.$ac_ext > conftest.tmp 2>&1'
+		if AC_TRY_EVAL(mh_compile); then
+			DYN_COMP=""
+		else
+			slash="\\"
+			mh_dyncomp="`egrep -c $slash$a conftest.tmp`"
+			if test "$mh_dyncomp" = "0"; then
+				DYN_COMP="$a -DDYNAMIC"
+				AC_MSG_RESULT($a)
+				break
+			else
+				DYN_COMP=""
+			fi
+		fi
+	done
+	if test "$DYN_COMP" = ""; then
+		AC_MSG_RESULT(none of $mh_cv_flags supported)
+	fi
+	if test "$LD_RXLIB1" = ""; then
+		MH_HOWTO_DYN_LINK()
+	fi
+	CFLAGS=$save_cflags
+	rm -f conftest.*
+fi
+
+
+SHL_TARGETS=""
+
+if test "$AIX_DYN" = "yes"; then
+	aix_exports="config.exports.aix"
+	echo "" > $aix_exports
+fi
+
+if test "$ac_cv_header_dl_h" = "yes" -o "$ac_cv_header_dlfcn_h" = "yes" -o "$AIX_DYN" = "yes" -o "$BEOS_DYN" = "yes" -o "$DLFCNINCDIR" != "" -o "$DLFCNLIBDIR" != ""; then
+	EXPS="1,2,3,4,5,6,7,8,9"
+	for a in $SHLFILES
+	do
+		SHL_TARGETS="${SHL_TARGETS} ${SHLPRE}${a}${SHLPST}"
+		this=`echo $EXPS | cut -d, -f1`
+		EXPS=`echo $EXPS | cut -d, -f2-`
+		if test "$AIX_DYN" = "yes"; then
+			echo "RXPACKEXP$this=$a.exp" >> $aix_exports
+			echo "RXPACKEXPORTS$this=-bE:$a.exp" >> $aix_exports
+		fi
+	done
+fi
+
+AC_SUBST(DYN_COMP)
+AC_SUBST(LIBS)
+AC_SUBST(LD_RXLIB1)
+AC_SUBST(SHLPRE)
+AC_SUBST(SHLPST)
+AC_SUBST(SHL_TARGETS)
+AC_SUBST(O2SAVE)
+AC_SUBST(CC2O)
+AC_SUBST(SAVE2O)
+AC_SUBST(RXPACKEXPORTS)
+])dnl
+
+dnl ---------------------------------------------------------------------------
+dnl Check if C compiler supports -c -o file.ooo
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_CC_O],
+[
+AC_MSG_CHECKING(whether $CC understand -c and -o together)
+set dummy $CC; ac_cc="`echo [$]2 |
+changequote(, )dnl
+		       sed -e 's/[^a-zA-Z0-9_]/_/g' -e 's/^[0-9]/_/'`"
+changequote([, ])dnl
+AC_CACHE_VAL(ac_cv_prog_cc_${ac_cc}_c_o,
+[echo 'foo(){}' > conftest.c
+# We do the test twice because some compilers refuse to overwrite an
+# existing .o file with -o, though they will create one.
+eval ac_cv_prog_cc_${ac_cc}_c_o=no
+ac_try='${CC-cc} -c conftest.c -o conftest.ooo 1>&AC_FD_CC'
+if AC_TRY_EVAL(ac_try) && test -f conftest.ooo && AC_TRY_EVAL(ac_try);
+then
+  ac_try='${CC-cc} -c conftest.c -o conftest.ooo 1>&AC_FD_CC'
+  if AC_TRY_EVAL(ac_try) && test -f conftest.ooo && AC_TRY_EVAL(ac_try);
+  then
+    eval ac_cv_prog_cc_${ac_cc}_c_o=yes
+  fi
+fi
+rm -f conftest*
+])dnl
+if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = yes"; then
+	O2SAVE=""
+	SAVE2O=""
+	CC2O="-o $"'@'
+	AC_MSG_RESULT(yes)
+else
+	O2SAVE="-mv \`basename "$'@'" .sho\`.o \`basename "$'@'" .sho\`.o.save;"
+	SAVE2O="-mv \`basename "$'@'" .sho\`.o "$'@'"; mv \`basename "$'@'" .sho\`.o.save \`basename "$'@'" .sho\`.o"
+	CC2O=""
+	AC_MSG_RESULT(no)
+fi
+])
+
+dnl ---------------------------------------------------------------------------
+dnl Determines the file extension for shared libraries
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_SHLPST],
+[
+AC_MSG_CHECKING(shared library extension)
+SHLPST=".so"
+AC_REQUIRE([AC_CANONICAL_SYSTEM])
+case "$target" in
+        *hp-hpux*)
+                SHLPST=".sl"
+                ;;
+        *ibm-aix*)
+                SHLPST=".a"
+                ;;
+        *qnx*)
+                SHLPST=""
+                ;;
+        *cygwin*)
+                SHLPST=".dll"
+                ;;
+        *darwin*)
+                SHLPST=".dylib"
+                ;;
+esac
+AC_SUBST(SHLPST)
+AC_MSG_RESULT($SHLPST)
+])
+
+dnl ---------------------------------------------------------------------------
+dnl Determine the system limit for number of signals
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([MH_CHECK_MAX_SIGNALS],
+[
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS $SYS_DEFS"
+AC_MSG_CHECKING(for maximum signal specifier:)
+AC_CACHE_VAL(mh_cv_max_signals,
+mh_found="no"
+for mh_sigs in $1; do
+	AC_TRY_COMPILE([#include <signal.h>],
+[return $mh_sigs;],
+  mh_found="yes"; mh_cv_max_signals="$mh_sigs" )
+	if test "$mh_found" = "yes"; then
+		break;
+	fi
+done)
+CPPFLAGS="$save_CPPFLAGS"
+if test "$mh_found" = "no"; then
+	AC_MSG_ERROR(Cannot find a system limit for number of signals. PDCurses cannot be configured on this machine.)
+else
+	AC_DEFINE_UNQUOTED(PDC_MAX_SIGNALS,$mh_cv_max_signals)
+	AC_MSG_RESULT($mh_cv_max_signals)
+fi
+])dnl