diff -ru SmallBASIC.orig/configure.ac SmallBASIC/configure.ac
--- SmallBASIC.orig/configure.ac	2018-08-18 15:58:59.300508539 +0200
+++ SmallBASIC/configure.ac	2018-08-18 16:04:05.394415143 +0200
@@ -117,7 +117,7 @@
 
    if test "${have_pcre}" = "yes" ; then
      AC_DEFINE(USE_PCRE, 1, [match.c used with libpcre.])
-     PACKAGE_LIBS="${PACKAGE_LIBS} `pcre-config --libs`"
+     PACKAGE_LIBS="${PACKAGE_LIBS} ${PCRE_LIBS}"
    fi
 }
 
@@ -325,7 +325,7 @@
 checkProfiling
 checkForWindows
 
-CFLAGS="${CFLAGS} -std=gnu11"
+CFLAGS="${CFLAGS} -std=gnu99"
 PACKAGE_CFLAGS="${PACKAGE_CFLAGS} -Wall -Wno-unused-result"
 BUILD_DATE=`date +"%a, %d %b %Y"`
 AC_DEFINE_UNQUOTED([BUILD_DATE],["$BUILD_DATE"],[Build date])
diff -ru SmallBASIC.orig/src/platform/console/main.cpp SmallBASIC/src/platform/console/main.cpp
--- SmallBASIC.orig/src/platform/console/main.cpp	2018-08-18 15:58:59.324509172 +0200
+++ SmallBASIC/src/platform/console/main.cpp	2018-08-18 16:04:21.506628434 +0200
@@ -332,7 +332,7 @@
   return gsb_last_error ? gsb_last_line : 0;
 }
 
-#if defined(__GNUC__) && !defined(__MACH__) && !defined(_Win32)
+#if defined(__GLIBC__) && !defined(__MACH__) && !defined(_Win32)
 // for analysing excessive malloc calls using kdbg
 extern "C" void *__libc_malloc(size_t size);
 void *malloc(size_t size) {