[PATCH] C99 compatibility fix for the configure script

[Florian Weimer]

It's necessary to include <term.h> for the function prototypes,
otherwise the check may fail unconditionally with compilers that no
longer support implicit function declarations (which were removed from C
in 1999).

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

diff --git gcal-4.1/configure.ac gcal-4.1/configure.ac
index f339765122b8fae0..a9c3993e81501713 100644
--- gcal-4.1/configure.ac
+++ gcal-4.1/configure.ac
@@ -319,7 +319,7 @@ if test "$gcal_cv_use_term" = yes; then
   AC_MSG_CHECKING(for working terminal libraries)
   SAVE_LIBS=$LIBS
   LIBS="$LIBS $TTYLIBS"
-  AC_TRY_LINK(,
+  AC_TRY_LINK([#include <term.h>],
     [tgetent(0); tgetflag(0); tgetnum(0); tgetstr(0);],
     [gcal_ttylibs_ok=yes])
   if test "$gcal_ttylibs_ok" = yes; then
@@ -334,7 +334,7 @@ if test "$gcal_cv_use_term" = yes; then
         [TTYLIBS="-ltermcap"])
       AC_MSG_CHECKING(for working terminal libraries again)
       LIBS="$LIBS $TTYLIBS"
-      AC_TRY_LINK(,
+      AC_TRY_LINK([#include <term.h>],
         [tgetent(0); tgetflag(0); tgetnum(0); tgetstr(0);],
         [gcal_ttylibs_ok=yes])
       if test "$gcal_ttylibs_ok" = yes; then

Thanks,
Florian