This works for me:

diff --git a/pkgs/development/libraries/audiofile/default.nix b/pkgs/development/libraries/audiofile/default.nix
index 46c29e2fa12..4362aec7da6 100644
--- a/pkgs/development/libraries/audiofile/default.nix
+++ b/pkgs/development/libraries/audiofile/default.nix
@@ -28,6 +28,8 @@ stdenv.mkDerivation rec {
   # fix build with gcc9
   NIX_CFLAGS_LINK = lib.optional (stdenv.system == "i686-linux") "-lgcc";
 
+  LIBTOOL_FLAGS = lib.optionalString stdenv.targetPlatform.isStatic "-static";
+
   patches = [
     ./gcc-6.patch
     ./CVE-2015-7747.patch

I suppose that line could even go into the adapter

This works for me:

diff --git a/pkgs/development/libraries/audiofile/default.nix b/pkgs/development/libraries/audiofile/default.nix
index 46c29e2fa12..4362aec7da6 100644
--- a/pkgs/development/libraries/audiofile/default.nix
+++ b/pkgs/development/libraries/audiofile/default.nix
@@ -28,6 +28,8 @@ stdenv.mkDerivation rec {
   # fix build with gcc9
   NIX_CFLAGS_LINK = lib.optional (stdenv.system == "i686-linux") "-lgcc";
 
+  LIBTOOL_FLAGS = lib.optionalString stdenv.targetPlatform.isStatic "-static";
+
   patches = [
     ./gcc-6.patch
     ./CVE-2015-7747.patch

Weird, doesn't work for me, I still have to keep both my hacks in

I suppose that line could even go into the adapter

nixpkgs/pkgs/stdenv/adapters.nix

Lines 46 to 48 in 2f75dec

	NIX_CFLAGS_LINK = toString (args.NIX_CFLAGS_LINK or "") + " -static";
	configureFlags = (args.configureFlags or []) ++ [
	"--disable-shared" # brrr...

Yeah, makes sense.

Weird, doesn't work for me, I still have to keep both my hacks in

My bad, LIBTOOLFLAGS doesn't seem to work for me either. I think it makes sense to return to the original commit minus the static argument.

Weird, doesn't work for me, I still have to keep both my hacks in

My bad, LIBTOOLFLAGS doesn't seem to work for me either. I think it makes sense to return to the original commit minus the static argument.

done, thanks for the feedback :)

Thanks!