1 files changed, 53 insertions, 0 deletions
diff --git a/libgcobol/configure b/libgcobol/configure
index 5f319ee..7271517 100755
--- a/libgcobol/configure
+++ b/libgcobol/configure
@@ -17275,6 +17275,59 @@ if test "$ac_res" != no; then :
 fi
 
 
+# Copied from gcc/configure.ac. 2025-06-05 R.J.Dubner
+# At least for glibc, clock_gettime is in librt.  But don't pull that
+# in if it still doesn't give us the function we want.
+ac_cv_func_clock_gettime=no
+if test $ac_cv_func_clock_gettime = no; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for clock_gettime in -lrt" >&5
+$as_echo_n "checking for clock_gettime in -lrt... " >&6; }
+if ${ac_cv_lib_rt_clock_gettime+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lrt  $LIBS"
+if test x$gcc_no_link = xyes; then
+  as_fn_error $? "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5
+fi
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char clock_gettime ();
+int
+main ()
+{
+return clock_gettime ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"; then :
+  ac_cv_lib_rt_clock_gettime=yes
+else
+  ac_cv_lib_rt_clock_gettime=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: $ac_cv_lib_rt_clock_gettime" >&5
+$as_echo "$ac_cv_lib_rt_clock_gettime" >&6; }
+if test "x$ac_cv_lib_rt_clock_gettime" = xyes; then :
+  LIBS="-lrt $LIBS"
+
+$as_echo "#define HAVE_CLOCK_GETTIME 1" >>confdefs.h
+
+fi
+
+fi
+
 have_iec_60559_libc_support=no
 if test "x$ac_cv_func_strtof128$ac_cv_func_strfromf128" = xyesyes \
    && test "x$libgcobol_have_sinf128$libgcobol_have_cacosf128" = xyesyes; then