diff -U 3 -dHrN -- gdl-1.0.0-rc.3_orig/CMakeLists.txt gdl-1.0.0-rc.3/CMakeLists.txt
--- gdl-1.0.0-rc.3_orig/CMakeLists.txt	2020-06-19 18:03:33.000000000 +0200
+++ gdl-1.0.0-rc.3/CMakeLists.txt	2021-07-31 21:36:40.184567405 +0200
@@ -162,6 +162,7 @@
 check_function_exists(malloc_zone_statistics HAVE_MALLOC_ZONE_STATISTICS)
 check_function_exists(sbrk HAVE_SBRK)
 check_function_exists(mallinfo HAVE_MALLINFO)
+check_function_exists(mallinfo2 HAVE_MALLINFO2)
 
 # mallocs
 check_include_file(malloc.h HAVE_MALLOC_H)
diff -U 3 -dHrN -- gdl-1.0.0-rc.3_orig/config.h.cmake gdl-1.0.0-rc.3/config.h.cmake
--- gdl-1.0.0-rc.3_orig/config.h.cmake	2020-06-19 18:03:33.000000000 +0200
+++ gdl-1.0.0-rc.3/config.h.cmake	2021-07-31 21:36:40.184567405 +0200
@@ -22,6 +22,7 @@
 #cmakedefine HAVE_LOCALE_H 1
 #cmakedefine HAVE_SBRK 1
 #cmakedefine HAVE_MALLINFO 1
+#cmakedefine HAVE_MALLINFO2 1
 #cmakedefine HAVE_MALLOC_H 1
 #cmakedefine HAVE_MALLOC_MALLOC_H 1
 #cmakedefine HAVE_MALLOC_ZONE_STATISTICS 1
diff -U 3 -dHrN -- gdl-1.0.0-rc.3_orig/src/basegdl.cpp gdl-1.0.0-rc.3/src/basegdl.cpp
--- gdl-1.0.0-rc.3_orig/src/basegdl.cpp	2020-06-19 18:03:33.000000000 +0200
+++ gdl-1.0.0-rc.3/src/basegdl.cpp	2021-07-31 22:10:51.046521975 +0200
@@ -769,7 +769,7 @@
 SizeT MemStats::HighWater = 0;
 SizeT MemStats::Current = 0;
 
-#if !defined(HAVE_MALLINFO) 
+#if (!defined(HAVE_MALLINFO) && !defined(HAVE_MALLINFO2))
 #  if (!defined(HAVE_MALLOC_ZONE_STATISTICS) || !defined(HAVE_MALLOC_MALLOC_H))
 #    if defined(HAVE_SBRK)
 char* MemStats::StartOfMemory = reinterpret_cast<char*>(::sbrk(0));
diff -U 3 -dHrN -- gdl-1.0.0-rc.3_orig/src/basegdl.hpp gdl-1.0.0-rc.3/src/basegdl.hpp
--- gdl-1.0.0-rc.3_orig/src/basegdl.hpp	2021-07-31 21:12:27.366570216 +0200
+++ gdl-1.0.0-rc.3/src/basegdl.hpp	2021-07-31 22:13:46.689456377 +0200
@@ -37,7 +37,7 @@
 #ifdef HAVE_MALLOC_MALLOC_H
 #  include <malloc/malloc.h>
 #endif
-#if !defined(HAVE_MALLINFO) 
+#if (!defined(HAVE_MALLINFO) && !defined(HAVE_MALLINFO2))
 #  if (!defined(HAVE_MALLOC_ZONE_STATISTICS) || !defined(HAVE_MALLOC_MALLOC_H))
 #    if defined(HAVE_SBRK)
 #      include <unistd.h>
@@ -292,7 +292,7 @@
   // SizeT has architecture-dependant size (32/64 bit)
   static SizeT NumAlloc, NumFree, HighWater, Current;
 
-#if !defined(HAVE_MALLINFO) 
+#if (!defined(HAVE_MALLINFO) && !defined(HAVE_MALLINFO2))
 #  if (!defined(HAVE_MALLOC_ZONE_STATISTICS) || !defined(HAVE_MALLOC_MALLOC_H))
 #    if defined(HAVE_SBRK)
   static char* StartOfMemory;
@@ -340,7 +340,12 @@
     // - the LLVM project (lib/System/Unix/Process.inc) see http://llvm.org/
     // - the Squid cache project (src/tools.cc) see http://squid-cache.org/
     // TODO (TOCHECK): Squid considers also gnumalloc.h - ?
-#if defined(HAVE_MALLINFO)
+#if defined(HAVE_MALLINFO2)
+    // Docs see below, newer versions of glibc deprecated mallinfo()
+    static struct mallinfo2 mi;
+    mi = mallinfo2();
+    Current = mi.arena+mi.hblkhd;
+#elif defined(HAVE_MALLINFO)
     // Linux case for example
     static struct mallinfo mi;
     mi = mallinfo();