add a --with-login-program configure argument

Saves messing around with LOGIN_PROGRAM env var, which come
packaging environments make hard to do during configure phase.

1 files changed, 17 insertions, 5 deletions

diff --git a/configure.ac b/configure.ac
index 1f1941a15..959826fe9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,15 +80,27 @@ if test -z "$AR" ; then
 fi
 
 # Use LOGIN_PROGRAM from environment if possible
-if test ! -z "$LOGIN_PROGRAM" ; then
-        AC_DEFINE_UNQUOTED([LOGIN_PROGRAM_FALLBACK], ["$LOGIN_PROGRAM"],
-                [If your header files don't define LOGIN_PROGRAM,
-                then use this (detected) from environment and PATH])
+login_program=$LOGIN_PROGRAM
+# Allow override on command-line
+AC_ARG_WITH([login-program],
+        [  --with-login-program=path Specify login program name ],
+        [
+                if test "x$withval" != "xno" && \
+                   test "x$withval" != "xyes" ; then
+                        login_program=$withval
+                fi
+        ]
+)
+# If no login_program specified then find one using the path.
+if test ! -z "$login_program" ; then
+        AC_DEFINE_UNQUOTED([LOGIN_PROGRAM_FALLBACK], ["$login_program"],
+                [login program to use if system headers lack LOGIN_PROGRAM])
 else
         # Search for login
         AC_PATH_PROG([LOGIN_PROGRAM_FALLBACK], [login])
         if test ! -z "$LOGIN_PROGRAM_FALLBACK" ; then
-                AC_DEFINE_UNQUOTED([LOGIN_PROGRAM_FALLBACK], ["$LOGIN_PROGRAM_FALLBACK"])
+                AC_DEFINE_UNQUOTED([LOGIN_PROGRAM_FALLBACK],
+                                   ["$LOGIN_PROGRAM_FALLBACK"])
         fi
 fi