#--------------------------------------------------------------------
#	Some systems (e.g., IRIX 4.0.5) lack some fields in struct stat. But
#	we might be able to use fstatfs instead. Some systems (OpenBSD?) also
#	lack blkcnt_t.
#--------------------------------------------------------------------

if test "$ac_cv_cygwin" != "yes"; then
AC_CHECK_MEMBERS([struct stat.st_blocks, struct stat.st_blksize])
fi
AC_CHECK_TYPES([blkcnt_t])
AC_CHECK_FUNC(fstatfs, , [AC_DEFINE(NO_FSTATFS, 1, [Do we have fstatfs()?])])

#--------------------------------------------------------------------
#       Some system have no memcmp or it does not work with 8 bit
#       data, this checks it and add memcmp.o to LIBOBJS if needed
#--------------------------------------------------------------------

#	"union wait" correctly.  It's needed because of weirdness in
#	HP-UX where "union wait" is defined in both the BSD and SYS-V
#	environments.  Checking the usability of WIFEXITED seems to do
#	the trick.
#--------------------------------------------------------------------

AC_CACHE_CHECK([union wait], tcl_cv_union_wait, [
    AC_TRY_LINK([#include <sys/types.h> 
    AC_TRY_LINK([#include <sys/types.h>
#include <sys/wait.h>], [
union wait x;
WIFEXITED(x);		/* Generates compiler error if WIFEXITED
			 * uses an int. */
    ], tcl_cv_union_wait=yes, tcl_cv_union_wait=no)])
if test $tcl_cv_union_wait = no; then
    AC_DEFINE(NO_UNION_WAIT, 1, [Do we have a usable 'union wait'?])

	], tcl_cv_api_fts=yes, tcl_cv_api_fts=no)])
if test $tcl_cv_api_fts = yes; then
    AC_DEFINE(HAVE_FTS, 1, [Do we have fts functions?])
fi

#--------------------------------------------------------------------
#	The statements below check for systems where POSIX-style
#	non-blocking I/O (O_NONBLOCK) doesn't work or is unimplemented. 
#	non-blocking I/O (O_NONBLOCK) doesn't work or is unimplemented.
#	On these systems (mostly older ones), use the old BSD-style
#	FIONBIO approach instead.
#--------------------------------------------------------------------

SC_BLOCKING_STYLE

#------------------------------------------------------------------------

    TCL_LIB_SPEC="-F${libdir} -framework Tcl"
    libdir="${libdir}/Tcl.framework/Versions/\${VERSION}"
    TCL_LIBRARY="${libdir}/Resources/Scripts"
    includedir="${libdir}/Headers"
    PRIVATE_INCLUDE_DIR="${libdir}/PrivateHeaders"
    HTML_DIR="${libdir}/Resources/Documentation/Reference/Tcl"
    EXTRA_INSTALL="install-private-headers html-tcl"
    EXTRA_BUILD_HTML='@ln -fs contents.htm "$(HTML_INSTALL_DIR)"/TclTOC.html' 
    EXTRA_BUILD_HTML='@ln -fs contents.htm "$(HTML_INSTALL_DIR)"/TclTOC.html'
    EXTRA_INSTALL_BINARIES='@echo "Installing Info.plist to $(LIB_INSTALL_DIR)/Resources" && mkdir -p "$(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) Tcl-Info.plist "$(LIB_INSTALL_DIR)/Resources/Info.plist"'
    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Installing license.terms to $(LIB_INSTALL_DIR)/Resources" && $(INSTALL_DATA) "$(TOP_DIR)/license.terms" "$(LIB_INSTALL_DIR)/Resources"'
    EXTRA_INSTALL_BINARIES="$EXTRA_INSTALL_BINARIES"' && echo "Finalizing Tcl.framework" && rm -f "$(LIB_INSTALL_DIR)/../Current" && ln -s "$(VERSION)" "$(LIB_INSTALL_DIR)/../Current" && for f in "$(LIB_FILE)" tclConfig.sh Resources Headers PrivateHeaders; do rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/Current/$$f" "$(LIB_INSTALL_DIR)/../.."; done && f="$(STUB_LIB_FILE)" && rm -f "$(LIB_INSTALL_DIR)/../../$$f" && ln -s "Versions/$(VERSION)/$$f" "$(LIB_INSTALL_DIR)/../.."'
    # Don't use AC_DEFINE for the following as the framework version define 
    # needs to go into the Makefile even when using autoheader, so that we  
    # Don't use AC_DEFINE for the following as the framework version define
    # needs to go into the Makefile even when using autoheader, so that we
    # can pick up a potential make override of VERSION. Also, don't put this
    # into CFLAGS as it should not go into tclConfig.sh
    EXTRA_CC_SWITCHES='-DTCL_FRAMEWORK_VERSION=\"$(VERSION)\"'
else
    # libdir must be a fully qualified path and not ${exec_prefix}/lib
    eval libdir="$libdir"
    if test "${TCL_LIB_VERSIONS_OK}" = "ok"; then