Allow openssl detection without pkg-config file.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

ConfigureChecks.cmake

@@ -27,6 +27,23 @@ endif( WITH_GCC_VISIBILITY )
 ##### check for openssl
 
 find_package( OpenSSL )
+if( NOT SSL_FOUND )
+    check_include_file( openssl/ssl.h HAVE_OPENSSL_H )
+    check_library_exists( ssl OPENSSL_init_ssl "" HAVE_LIBSSL_11 )
+    if( NOT HAVE_LIBSSL_11 )
+      check_library_exists( ssl SSL_library_init "" HAVE_LIBSSL )
+    endif( )
+    check_library_exists( crypto EVP_EncryptInit_ex "" HAVE_LIBCRYPTO )
+    if( HAVE_OPENSSL_H AND (HAVE_LIBSSL_11 OR HAVEL_LIBSSL) AND HAVE_LIBCRYPTO )
+      set( SSL_FOUND 1 CACHE INTERNAL "" FORCE )
+      find_file( OPENSSLV_H openssl/opensslv.h )
+      file( STRINGS "${OPENSSLV_H}" SSL_VERSION REGEX "#[ \t]*define[ \t]*OPENSSL_VERSION_TEXT" )
+      string( REGEX REPLACE "# *define[ \t]*OPENSSL_VERSION_TEXT[ \t]*\"[^0-9 ]* *([^ ]*).*" "\\1"
+              SSL_VERSION "${SSL_VERSION}" )
+      set( SSL_VERSION "${SSL_VERSION}" CACHE INTERNAL "" FORCE )
+      message( STATUS "Found OpenSSL: version ${SSL_VERSION}" )
+    endif( HAVE_OPENSSL_H AND (HAVE_LIBSSL_11 OR HAVEL_LIBSSL) AND HAVE_LIBCRYPTO )
+endif( NOT SSL_FOUND )
 if( NOT OPENSSL_FOUND )
     tde_message_fatal( "OpenSSL is required but was not found on your system" )
 endif()