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-rw-r--r--configure.in5
1 files changed, 5 insertions, 0 deletions
diff --git a/configure.in b/configure.in
index 0e7cca9e6b..ffa7d82bab 100644
--- a/configure.in
+++ b/configure.in
@@ -1176,6 +1176,11 @@ LIBS="$old_LIBS"
 AC_MSG_RESULT($LIBGD)
 AC_SUBST(LIBGD)
 
+dnl check for the size of 'long double'.
+AC_CHECK_SIZEOF(long double, 0)
+sizeof_long_double=$ac_cv_sizeof_long_double
+AC_SUBST(sizeof_long_double)
+
 ### End of automated tests.
 ### Now run sysdeps configure fragments.