djgpp 2.05 finally provides posix-compatible memalign, but it is broken,
so use disable it if this version is detected.

discussion: 
http://www.delorie.com/archives/browse.cgi?p=djgpp/2017/12/29/16:26:58
---
 configure | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 6d58d30df6..5d2f57684c 100755
--- a/configure
+++ b/configure
@@ -6793,10 +6793,17 @@ check_deps $CONFIG_LIST       \
 enabled threads && ! enabled pthreads && ! enabled atomics_native && die "non 
pthread threading without atomics not supported, try adding --enable-pthreads 
or --cpu=i486 or higher if you are on x86"
 enabled avresample && warn "Building with deprecated library libavresample"
 
-if test $target_os = "haiku"; then
+case $target_os in
+haiku)
     disable memalign
     disable posix_memalign
-fi
+    ;;
+*-dos|freedos|opendos)
+    if test_cpp_condition sys/version.h "defined(__DJGPP__) && __DJGPP__ == 2 
&& __DJGPP_MINOR == 5"; then
+        disable memalign
+    fi
+    ;;
+esac
 
 flatten_extralibs(){
     nested_entries=
-- 
2.17.1

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

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