Dump on startup linked and loaded lib versions.

For now only zlib supported.
Also detect zlib by pkgconfig in configure.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/resources/mapreader.cpp b/src/resources/mapreader.cpp
index 9156f334d..cfce7c397 100644
--- a/src/resources/mapreader.cpp
+++ b/src/resources/mapreader.cpp
@@ -128,9 +128,9 @@ int inflateMemory(unsigned char *restrict const in,
     out = static_cast<unsigned char*>(calloc(bufferSize, 1));
 
     z_stream strm;
-    strm.zalloc = Z_NULL;
-    strm.zfree = Z_NULL;
-    strm.opaque = Z_NULL;
+    strm.zalloc = nullptr;
+    strm.zfree = nullptr;
+    strm.opaque = nullptr;
     strm.next_in = in;
     strm.avail_in = inLength;
     strm.next_out = out;