Add a check for openssl that accepts explicit file locations.

configure.in

@@ -1,9 +1,9 @@
 dnl Process this file with autoconf to produce a configure script.
 
-dnl $Id: configure.in,v 1.13.2.16 2000/11/08 20:52:36 guus Exp $
+dnl $Id: configure.in,v 1.13.2.17 2000/11/13 22:01:26 zarq Exp $
 
 AC_INIT(src/tincd.c)
-AM_INIT_AUTOMAKE(tinc, 1.0pre3)
+AM_INIT_AUTOMAKE(tinc, 1.0pre4)
 AM_CONFIG_HEADER(config.h)
 
 dnl Include the macros from the m4/ directory
@@ -58,17 +58,7 @@ AC_CHECK_LIB(dl, dlopen, [
 
 
 dnl Crypto stuff
-
+tinc_OPENSSL
-libcrypto=none
-AC_CHECK_LIB(crypto, SHA1_version, [
-  libcrypto=yes
-])
-
-if test $libcrypto = none; then
-  AC_MSG_ERROR(It seems like OpenSSL is not installed on this system.)
-else
-  LIBS="$LIBS -lcrypto"
-fi
 
 
 dnl Support for SunOS
@@ -86,7 +76,7 @@ tinc_TUNTAP
 
 dnl Check if checkpoint tracing has to be enabled
 AC_ARG_ENABLE(tracing,
-  --enable-tracing	enable checkpoint tracing (for debugging purposes only),
+  [  --enable-tracing   enable checkpoint tracing (for debugging purposes only)],
   [ AC_DEFINE(ENABLE_TRACING) ]
 )
 

m4/openssl.m4

@@ -0,0 +1,54 @@
+dnl Check to find the OpenSSL headers/libraries
+
+
+AC_DEFUN(tinc_OPENSSL,
+[
+
+  AC_CACHE_CHECK([for openssl], tinc_cv_openssl_include,
+  [
+    AC_ARG_WITH(openssl,
+      [  --with-openssl=DIR      OpenSSL library and headers prefix],
+      [echo -ne 'prefix...'
+       openssl_lib="$withval/lib"
+       openssl_include="$withval/include"]
+    )
+    AC_ARG_WITH(openssl-include,
+      [  --with-openssl-include=DIR OpenSSL headers directory],
+      [echo -ne 'includes...'
+       openssl_include="$withvall"]
+    )
+    AC_ARG_WITH(openssl-lib,
+      [  --with-openssl-lib=DIR  OpenSSL library directory],
+      [echo -ne 'libraries...'
+       openssl_lib="$withval"]
+    )
+
+if test "x$openssl_lib" != "x" ; then
+  LIBS="$LIBS -L$openssl_lib"
+fi
+if test "x$openssl_include" != "x" ; then
+  INCLUDES="$INCLUDES -I$openssl_include"
+fi
+
+AC_MSG_RESULT([done.])
+  ])
+
+libcrypto=none
+AC_CHECK_LIB(crypto, SHA1_version, [
+  libcrypto=yes
+])
+
+if test $libcrypto = none; then
+  AC_MSG_ERROR(
+[It seems like OpenSSL is not installed on this system.  But perhaps
+you need to supply the exact location of the headers and libraries.
+You can try running configure with the --with-openssl=/DIRECTORY
+parameter.  If you installed the headers and libraries in a different
+location you can use --with-openssl-include=/DIR and
+--with-openssl-lib=/DIR.])
+
+else
+  LIBS="$LIBS -lcrypto"
+fi
+
+])