[evolution-data-server] Correct WITH_LIBDB configure option processing

[Milan Crha <mcrha src gnome org>]

commit dff0abc8b978ed9b8dd65d1abd3f379295e178f5
Author: Milan Crha <mcrha redhat com>
Date:   Wed Nov 2 13:29:32 2016 +0100

    Correct WITH_LIBDB configure option processing

 CMakeLists.txt |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c73404e..5588f3a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -454,15 +454,19 @@ endif(NOT WIN32)
 # ******************************
 # libdb checking
 # ******************************
-add_printable_variable(WITH_LIBDB "Prefix where libdb is installed" "")
+add_printable_variable(WITH_LIBDB "Prefix where libdb is installed" ON)
 add_printable_variable(WITH_LIBDB_CFLAGS "Arguments required to compile with libdb" "")
 add_printable_variable(WITH_LIBDB_LIBS "Arguments required to link with libdb" "")
 
-if(NOT ("${WITH_LIBDB}" STREQUAL "NO"))
-       if(NOT (("${WITH_LIBDB}" STREQUAL "") OR ("${WITH_LIBDB}" STREQUAL "YES")))
+if(WITH_LIBDB STREQUAL "")
+       set(WITH_LIBDB ON)
+endif(WITH_LIBDB STREQUAL "")
+
+if(WITH_LIBDB)
+       if(NOT (WITH_LIBDB OR ("${WITH_LIBDB}" STREQUAL "YES")))
                set(LIBDB_CFLAGS "-I${WITH_LIBDB}/include")
                set(LIBDB_LIBS "-L${WITH_LIBDB}/lib -ldb")
-       else(NOT (("${WITH_LIBDB}" STREQUAL "") OR ("${WITH_LIBDB}" STREQUAL "YES")))
+       else(NOT (WITH_LIBDB OR ("${WITH_LIBDB}" STREQUAL "YES")))
                if(("${WITH_LIBDB_CFLAGS}" STREQUAL "") AND ("${WITH_LIBDB_LIBS}" STREQUAL ""))
                        set(LIBDB_CFLAGS "")
                        set(LIBDB_LIBS "-ldb")
@@ -470,7 +474,7 @@ if(NOT ("${WITH_LIBDB}" STREQUAL "NO"))
                        set(LIBDB_CFLAGS ${WITH_LIBDB_CFLAGS})
                        set(LIBDB_LIBS ${WITH_LIBDB_LIBS})
                endif(("${WITH_LIBDB_CFLAGS}" STREQUAL "") AND ("${WITH_LIBDB_LIBS}" STREQUAL ""))
-       endif(NOT (("${WITH_LIBDB}" STREQUAL "") OR ("${WITH_LIBDB}" STREQUAL "YES")))
+       endif(NOT (WITH_LIBDB OR ("${WITH_LIBDB}" STREQUAL "YES")))
 
        set(CMAKE_REQUIRED_FLAGS ${LIBDB_CFLAGS})
        set(CMAKE_REQUIRED_LIBRARIES ${LIBDB_LIBS})
@@ -482,7 +486,7 @@ if(NOT ("${WITH_LIBDB}" STREQUAL "NO"))
        if(NOT HAVE_LIBDB)
                message(FATAL_ERROR "libdb not found. Use -DWITH_LIBDB=PATH to specify the library prefix, or 
use -DWITH_LIBDB_CFLAGS=-I/path/to/db/include and -DWITH_LIBDB_LIBS=/path/to/db/lib to specify arguments for 
compiling and linking. If you want to disable libdb, please use -DWITH_LIBDB=OFF")
        endif(NOT HAVE_LIBDB)
-endif(NOT ("${WITH_LIBDB}" STREQUAL "NO"))
+endif(WITH_LIBDB)
 
 # ******************************
 # iconv checking