-FPTOOLS_CHECK_LIB_NOWARN(m, atan)
-
-dnl ---------- usleep ----------
-dnl --- stolen from guile configure ---
-dnl --- FIXME: /usr/include/unistd.h can't be right?
-
-### On some systems usleep has no return value. If it does have one,
-### we'd like to return it; otherwise, we'll fake it.
-AC_CACHE_CHECK([return type of usleep], cv_func_usleep_return_type,
- [AC_EGREP_HEADER(changequote(<, >)<void[ ]+usleep>changequote([, ]),
- /usr/include/unistd.h,
- [cv_func_usleep_return_type=void],
- [cv_func_usleep_return_type=int])])
-case "$cv_func_usleep_return_type" in
- "void" )
- AC_DEFINE([USLEEP_RETURNS_VOID], [1], [Define if the system headers declare usleep to return void.])
- ;;
-esac
-
-dnl --------------------------------------------------
-dnl * test for in_addr_t
-dnl --------------------------------------------------
-AC_MSG_CHECKING(for in_addr_t in netinet/in.h)
-AC_EGREP_HEADER(in_addr_t, netinet/in.h,
- [ AC_DEFINE([HAVE_IN_ADDR_T], [1], [Define to 1 if in_addr_t is available.]) AC_MSG_RESULT(yes) ],
- AC_MSG_RESULT(no))
-
-dnl --------------------------------------------------
-dnl * test for Linux sendfile(2)
-dnl --------------------------------------------------
-AC_MSG_CHECKING(for sendfile in sys/sendfile.h)
-AC_EGREP_HEADER(sendfile, sys/sendfile.h,
- [ AC_DEFINE([HAVE_LINUX_SENDFILE], [1], [Define to 1 if you have a Linux sendfile(2) implementation.]) AC_MSG_RESULT(yes) ],
- AC_MSG_RESULT(no))
-
-dnl --------------------------------------------------
-dnl * test for BSD sendfile(2)
-dnl --------------------------------------------------
-AC_MSG_CHECKING(for sendfile in sys/socket.h)
-AC_EGREP_HEADER(sendfile, sys/socket.h,
- [ AC_DEFINE([HAVE_BSD_SENDFILE], [1], [Define to 1 if you have a BSDish sendfile(2) implementation.]) AC_MSG_RESULT(yes) ],
- AC_MSG_RESULT(no))
-
-dnl --------------------------------------------------
-dnl * test for GTK+
-dnl --------------------------------------------------
-
-AC_PATH_PROGS([GTK_CONFIG], [gtk-config gtk12-config])
-if test -n "$GTK_CONFIG"; then
- AC_CACHE_CHECK([for version of GTK+], [fp_cv_gtk_version],
- [fp_cv_gtk_version=`$GTK_CONFIG --version`])
- FP_COMPARE_VERSIONS([$fp_cv_gtk_version], [-lt], [1.2],
- [AC_MSG_WARN([GTK+ not usable, need at least version 1.2])
- GTK_CONFIG=])
-fi
-AC_SUBST([GTK_CONFIG])
+dnl ** sometimes RTLD_NEXT is hidden in #ifdefs we really don't wan to set
+AC_MSG_CHECKING(for RTLD_NEXT from dlfcn.h)
+AC_EGREP_CPP(yes,
+[
+ #include <dlfcn.h>
+ #ifdef RTLD_NEXT
+ yes
+ #endif
+], [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_RTLDNEXT], [1], [Define to 1 if we can see RTLD_NEXT in dlfcn.h.])
+ HaveRtldNext=YES
+], [
+ AC_MSG_RESULT(no)
+ HaveRtldNext=NO
+ ])
+AC_SUBST(HaveRtldNext)
+
+dnl ** RTLD_LOCAL isn't available on cygwin or openbsd
+AC_MSG_CHECKING(for RTLD_LOCAL from dlfcn.h)
+AC_EGREP_CPP(yes,
+[
+ #include <dlfcn.h>
+ #ifdef RTLD_LOCAL
+ yes
+ #endif
+], [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_RTLDLOCAL], [1], [Define to 1 if RTLD_LOCAL is available.])
+ HaveRtldLocal=YES
+], [
+ AC_MSG_RESULT(no)
+ HaveRtldLocal=NO
+ ])
+AC_SUBST(HaveRtldLocal)
+
+dnl ** RTLD_GLOBAL isn't available on openbsd
+AC_MSG_CHECKING(for RTLD_GLOBAL from dlfcn.h)
+AC_EGREP_CPP(yes,
+[
+ #include <dlfcn.h>
+ #ifdef RTLD_GLOBAL
+ yes
+ #endif
+], [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_RTLDGLOBAL], [1], [Define to 1 if RTLD_GLOBAL is available.])
+ HaveRtldGlobal=YES
+], [
+ AC_MSG_RESULT(no)
+ HaveRtldGlobal=NO
+ ])
+AC_SUBST(HaveRtldGlobal)
+
+dnl ** RTLD_NOW isn't available on openbsd
+AC_MSG_CHECKING(for RTLD_NOW from dlfcn.h)
+AC_EGREP_CPP(yes,
+[
+ #include <dlfcn.h>
+ #ifdef RTLD_NOW
+ yes
+ #endif
+], [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_RTLDNOW], [1], [Define to 1 if we can see RTLD_NOW in dlfcn.h])
+ HaveRtldNow=YES
+], [
+ AC_MSG_RESULT(no)
+ HaveRtldNow=NO
+ ])
+AC_SUBST(HaveRtldNow)