https://github.com/proftpd/proftpd/commit/8fc570bc13e771d3ecafe53ab94ada0be2b6646a
https://bugs.gentoo.org/777531

From 8fc570bc13e771d3ecafe53ab94ada0be2b6646a Mon Sep 17 00:00:00 2001
From: TJ Saunders <tj@castaglia.org>
Date: Tue, 23 Mar 2021 19:50:49 -0700
Subject: [PATCH] Issue #1207: Properly honor the `--disable-curses`,
 `--disable-ncurses` configure options.

---
 configure    | 156 +++++++++++++++++++++++++++++++++++++++++++++++----
 configure.in |  39 +++++++++----
 2 files changed, 172 insertions(+), 23 deletions(-)

diff --git a/configure b/configure
index 86cf1360e..59df363fa 100755
--- a/configure
+++ b/configure
@@ -22970,7 +22970,7 @@ $as_echo "#define SETGRENT_VOID 1" >>confdefs.h
 fi
 
 
-if test x"$ac_cv_header_curses_h" = xyes; then
+if test x"$enable_curses" != xno ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for initscr in -lcurses" >&5
 $as_echo_n "checking for initscr in -lcurses... " >&6; }
 if ${ac_cv_lib_curses_initscr+:} false; then :
@@ -23013,12 +23013,154 @@ if test "x$ac_cv_lib_curses_initscr" = xyes; then :
 $as_echo "#define HAVE_LIBCURSES 1" >>confdefs.h
 
 
+$as_echo "#define PR_USE_CURSES 1" >>confdefs.h
+
+
 fi
 
+
+          if test x"$enable_nls" = xyes ; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for halfdelay in -ltinfow" >&5
+$as_echo_n "checking for halfdelay in -ltinfow... " >&6; }
+if ${ac_cv_lib_tinfow_halfdelay+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-ltinfow  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$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 halfdelay ();
+int
+main ()
+{
+return halfdelay ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_tinfow_halfdelay=yes
+else
+  ac_cv_lib_tinfow_halfdelay=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_tinfow_halfdelay" >&5
+$as_echo "$ac_cv_lib_tinfow_halfdelay" >&6; }
+if test "x$ac_cv_lib_tinfow_halfdelay" = xyes; then :
+   UTILS_LIBS="$UTILS_LIBS -ltinfow"
+
+$as_echo "#define HAVE_LIBTINFOW 1" >>confdefs.h
+
+
+else
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for halfdelay in -ltinfo" >&5
+$as_echo_n "checking for halfdelay in -ltinfo... " >&6; }
+if ${ac_cv_lib_tinfo_halfdelay+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-ltinfo  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$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 halfdelay ();
+int
+main ()
+{
+return halfdelay ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_tinfo_halfdelay=yes
+else
+  ac_cv_lib_tinfo_halfdelay=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_tinfo_halfdelay" >&5
+$as_echo "$ac_cv_lib_tinfo_halfdelay" >&6; }
+if test "x$ac_cv_lib_tinfo_halfdelay" = xyes; then :
+   UTILS_LIBS="$UTILS_LIBS -ltinfo"
+
+$as_echo "#define HAVE_LIBTINFO 1" >>confdefs.h
+
+
+fi
+
+
+fi
+
+  else
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for halfdelay in -ltinfo" >&5
+$as_echo_n "checking for halfdelay in -ltinfo... " >&6; }
+if ${ac_cv_lib_tinfo_halfdelay+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-ltinfo  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$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 halfdelay ();
+int
+main ()
+{
+return halfdelay ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_tinfo_halfdelay=yes
+else
+  ac_cv_lib_tinfo_halfdelay=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_tinfo_halfdelay" >&5
+$as_echo "$ac_cv_lib_tinfo_halfdelay" >&6; }
+if test "x$ac_cv_lib_tinfo_halfdelay" = xyes; then :
+   UTILS_LIBS="$UTILS_LIBS -ltinfo"
+
+$as_echo "#define HAVE_LIBTINFO 1" >>confdefs.h
+
+
+fi
+
+  fi
+fi
+
+if test x"$enable_ncurses" != xno ; then
+  pr_have_ncursesw="no"
 
-pr_have_ncursesw="no"
-if test x"$ac_cv_header_ncurses_h" = xyes; then
 
   if test x"$enable_nls" = xyes ; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for initscr in -lncursesw" >&5
@@ -23160,15 +23302,7 @@ $as_echo "#define HAVE_LIBNCURSES 1" >>confdefs.h
 fi
 
   fi
-fi
 
-if test x"$enable_curses" != xno ; then
-
-$as_echo "#define PR_USE_CURSES 1" >>confdefs.h
-
-fi
-
-if test x"$enable_ncurses" != xno ; then
 
   if test x"$pr_have_ncursesw" = xyes ; then
 
diff --git a/configure.in b/configure.in
index 4bd0f7c19..01ec7863e 100644
--- a/configure.in
+++ b/configure.in
@@ -2749,17 +2749,38 @@ fi
 dnl Custom-rolled macro for checking return type of setgrent(3)
 PR_FUNC_SETGRENT_VOID
 
-dnl Perform checks for curses/ncurses libraries only if the corresponding
-dnl headers have been found.
-if test x"$ac_cv_header_curses_h" = xyes; then
+if test x"$enable_curses" != xno ; then
   AC_CHECK_LIB(curses, initscr,
     [ CURSES_LIBS="-lcurses"
       AC_DEFINE(HAVE_LIBCURSES, 1, [Define if you have curses])
+      AC_DEFINE(PR_USE_CURSES, 1, [Define if using curses support])
     ])
+
+  dnl Check for the libtinfo library, which contains the stdscr symbol,
+  dnl halfdelay curses function on some systems (e.g. Gentoo); see
+  dnl Issue #1207.  Note that on some systems, this may need to be libtinfow
+  dnl instead.
+  if test x"$enable_nls" = xyes ; then
+    AC_CHECK_LIB(tinfow, halfdelay,
+      [ UTILS_LIBS="$UTILS_LIBS -ltinfow"
+        AC_DEFINE(HAVE_LIBTINFOW, 1, [Define if you have libtinfow])
+      ],
+      [ AC_CHECK_LIB(tinfo, halfdelay,
+        [ UTILS_LIBS="$UTILS_LIBS -ltinfo"
+          AC_DEFINE(HAVE_LIBTINFO, 1, [Define if you have libtinfo])
+        ])
+      ])
+  else
+    AC_CHECK_LIB(tinfo, halfdelay,
+      [ UTILS_LIBS="$UTILS_LIBS -ltinfo"
+        AC_DEFINE(HAVE_LIBTINFO, 1, [Define if you have libtinfo])
+      ])
+  fi
 fi
 
-pr_have_ncursesw="no"
-if test x"$ac_cv_header_ncurses_h" = xyes; then
+if test x"$enable_ncurses" != xno ; then
+  pr_have_ncursesw="no"
+
   dnl If NLS support has been enabled, then check for the locale-sensitive
   dnl libncursesw library first; if not found, or if no NLS support, then
   dnl check for libncurses.
@@ -2776,19 +2797,13 @@ if test x"$ac_cv_header_ncurses_h" = xyes; then
           ])
       ])
 
-  else 
+  else
     AC_CHECK_LIB(ncurses, initscr,
       [ CURSES_LIBS="-lncurses"
         AC_DEFINE(HAVE_LIBNCURSES, 1, [Define if you have ncurses])
       ])
   fi
-fi
-
-if test x"$enable_curses" != xno ; then
-  AC_DEFINE(PR_USE_CURSES, 1, [Define if using curses support])
-fi
 
-if test x"$enable_ncurses" != xno ; then
   dnl Check for the libtinfo library, which contains the halfdelay() curses
   dnl function on some systems (e.g. OpenSuSE); see Bug#3718.  Note that on
   dnl some systems, this may need to be libtinfow instead; see Issue #1174.