Add --enable-openssl-pkgconfig-template option.

This can be used to find the correct openssl pkg-config file
if it is not named "openssl" (also libcrypto).

INSTALL

@@ -636,6 +636,13 @@ Authentication options:
         not be used as they do not support TLS 1.2.  If specified,
         DIR should contain the OpenSSL include and lib directories.
 
+  --enable-openssl-pkgconfig-template=template
+        A printf-style template used to construct the name of the
+        openssl and libcrypto pkg-config files.  For example, a
+        template of "e%s30" would cause "eopenssl30" and "libecrypto30"
+        to be used instead.  This makes it possible to link with
+        the OpenSSL 3.0 package on OpenBSD.  Defaults to "%s".
+
 Development options:
   --enable-env-debug
         Enable debugging of the environment setting functions.  This

configure

@@ -1043,6 +1043,7 @@ enable_pvs_studio
 enable_log_server
 enable_log_client
 enable_openssl
+enable_openssl_pkgconfig_template
 enable_gcrypt
 enable_python
 enable_shared
@@ -1758,6 +1759,9 @@ Optional Features:
   --disable-log-client    Disable sudoers support for using the sudo_logsrvd
                           log server.
   --enable-openssl        Use OpenSSL's TLS and sha2 functions
+  --enable-openssl-pkgconfig-template
+                          A printf format string used to contruct the OpenSSL
+                          pkg-config name
   --enable-gcrypt         Use GNU crypt's sha2 functions
   --enable-python         Compile python plugin support
   --enable-shared[=PKGS]  build shared libraries [default=yes]
@@ -6970,6 +6974,14 @@ else $as_nop
 
 fi
 
+# Check whether --enable-openssl-pkgconfig-template was given.
+if test ${enable_openssl_pkgconfig_template+y}
+then :
+  enableval=$enable_openssl_pkgconfig_template;
+else $as_nop
+  enable_openssl_pkgconfig_template="%s"
+fi
+
 
 # Check whether --enable-gcrypt was given.
 if test ${enable_gcrypt+y}
@@ -23286,7 +23298,8 @@ if test "${enable_openssl-no}" != no; then
 	PKG_CONFIG=false
     fi
     : ${PKG_CONFIG='pkg-config'}
-    if $PKG_CONFIG --exists "openssl >= 1.0.1" >/dev/null 2>&1; then
+    pkg_openssl=`printf $enable_openssl_pkgconfig_template "openssl"`
+    if $PKG_CONFIG --exists "$pkg_openssl >= 1.0.1" >/dev/null 2>&1; then
 	printf "%s\n" "#define HAVE_OPENSSL 1" >>confdefs.h
 
 	if test "$enable_openssl" = "maybe"; then
@@ -23294,7 +23307,7 @@ if test "${enable_openssl-no}" != no; then
 	fi
 
 	O_LDFLAGS="$LDFLAGS"
-	LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs-only-L openssl`"
+	LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs-only-L $pkg_openssl`"
 	# Check whether --static is needed
 	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for SSL_new in -lssl" >&5
 printf %s "checking for SSL_new in -lssl... " >&6; }
@@ -23383,16 +23396,17 @@ fi
 	LDFLAGS="$O_LDFLAGS"
 
 	# Use pkg-config to determine OpenSSL libs and cflags
-	LIBTLS=`$PKG_CONFIG $STATIC --libs openssl`
+	LIBTLS=`$PKG_CONFIG $STATIC --libs $pkg_openssl`
 	if test "$DIGEST" = "digest_openssl.lo"; then
-	    if $PKG_CONFIG --exists libcrypto >/dev/null 2>&1; then
-		LIBMD=`$PKG_CONFIG $STATIC --libs libcrypto`
+	    pkg_libcrypto=lib`printf $enable_openssl_pkgconfig_template "crypto"`
+	    if $PKG_CONFIG --exists $pkg_libcrypto >/dev/null 2>&1; then
+		LIBMD=`$PKG_CONFIG $STATIC --libs $pkg_libcrypto`
 	    else
 		# No separate pkg config for libcrypto
 		LIBMD="$LIBTLS"
 	    fi
 	fi
-	for f in `$PKG_CONFIG --cflags-only-I openssl`; do
+	for f in `$PKG_CONFIG --cflags-only-I $pkg_openssl`; do
 
 if test ${CPPFLAGS+y}
 then :

configure.ac

@@ -1570,6 +1570,9 @@ AC_ARG_ENABLE(openssl,
 	enable_openssl=maybe
     fi
 ])
+AC_ARG_ENABLE(openssl-pkgconfig-template,
+[AS_HELP_STRING([--enable-openssl-pkgconfig-template], [A printf format string used to contruct the OpenSSL pkg-config name])],
+[], [enable_openssl_pkgconfig_template="%s"])
 
 AC_ARG_ENABLE(gcrypt,
 [AS_HELP_STRING([--enable-gcrypt], [Use GNU crypt's sha2 functions])], [
@@ -2941,14 +2944,15 @@ if test "${enable_openssl-no}" != no; then
 	PKG_CONFIG=false
     fi
     : ${PKG_CONFIG='pkg-config'}
-    if $PKG_CONFIG --exists "openssl >= 1.0.1" >/dev/null 2>&1; then
+    pkg_openssl=`printf $enable_openssl_pkgconfig_template "openssl"`
+    if $PKG_CONFIG --exists "$pkg_openssl >= 1.0.1" >/dev/null 2>&1; then
 	AC_DEFINE(HAVE_OPENSSL)
 	if test "$enable_openssl" = "maybe"; then
 	    enable_openssl=yes
 	fi
 
 	O_LDFLAGS="$LDFLAGS"
-	LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs-only-L openssl`"
+	LDFLAGS="$LDFLAGS `$PKG_CONFIG --libs-only-L $pkg_openssl`"
 	# Check whether --static is needed
 	AC_CHECK_LIB(ssl, SSL_new, [STATIC=""], [STATIC="--static"], [-lcrypto])
 
@@ -2957,16 +2961,17 @@ if test "${enable_openssl-no}" != no; then
 	LDFLAGS="$O_LDFLAGS"
 
 	# Use pkg-config to determine OpenSSL libs and cflags
-	LIBTLS=`$PKG_CONFIG $STATIC --libs openssl`
+	LIBTLS=`$PKG_CONFIG $STATIC --libs $pkg_openssl`
 	if test "$DIGEST" = "digest_openssl.lo"; then
-	    if $PKG_CONFIG --exists libcrypto >/dev/null 2>&1; then
-		LIBMD=`$PKG_CONFIG $STATIC --libs libcrypto`
+	    pkg_libcrypto=lib`printf $enable_openssl_pkgconfig_template "crypto"`
+	    if $PKG_CONFIG --exists $pkg_libcrypto >/dev/null 2>&1; then
+		LIBMD=`$PKG_CONFIG $STATIC --libs $pkg_libcrypto`
 	    else
 		# No separate pkg config for libcrypto
 		LIBMD="$LIBTLS"
 	    fi
 	fi
-	for f in `$PKG_CONFIG --cflags-only-I openssl`; do
+	for f in `$PKG_CONFIG --cflags-only-I $pkg_openssl`; do
 	    AX_APPEND_FLAG([$f], [CPPFLAGS])
 	done
     else