diff --git a/default.nix b/default.nix
index 9deb288..ceff8bb 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,10 @@
 self: super: rec {
-  libevhtp = super.callPackage ./libevhtp/default.nix {};
+  # TODO: modify oniguruma derivation instead, pass at callPackage stage
+  # Since onig-6.9.5_rev1 the POSIX API is disabled by default, causing the libevhtp build relying on it to fail
+  onigWithPosixAPI = super.oniguruma.overrideAttrs (oldAttrs: {configureFlags = [ "--enable-posix-api=yes" ];});
+  libevhtp = super.callPackage ./libevhtp/default.nix {oniguruma = onigWithPosixAPI;};
   libsearpc = super.callPackage ./libsearpc/default.nix {};
-  seafile-server = super.callPackage ./seafile-server/default.nix { inherit libevhtp python3Packages libsearpc;};
+  seafile-server = super.callPackage ./seafile-server/default.nix { inherit libevhtp python3Packages libsearpc; oniguruma = onigWithPosixAPI;};
   python3Packages = super.python3Packages // rec {
     jsonfield = super.python3Packages.callPackage ./jsonfield {};
     django-simple-captcha = super.python3Packages.callPackage ./django-simple-captcha { inherit django-ranged-response; };
@@ -11,6 +14,5 @@ self: super: rec {
     captcha = super.python3Packages.callPackage ./captcha {};
     django-formtools = super.python3Packages.callPackage ./django-formtools {};
     seafile-bindings = super.python3Packages.toPythonModule seafile-server.seafile-server-core;
-    ccnet-bindings = super.python3Packages.toPythonModule seafile-server.ccnet-server;
   };
 }
diff --git a/libevhtp/default.nix b/libevhtp/default.nix
index e1a5dc6..45a2f92 100644
--- a/libevhtp/default.nix
+++ b/libevhtp/default.nix
@@ -16,8 +16,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ libevent pth openssl ];
-  propagatedBuildInputs = [ oniguruma ];
+  buildInputs = [ libevent pth openssl oniguruma ];
   # fix pkgconfig librarypath generation
   patches = [ ./pkgconfig-librarypath.patch ];
   #cmakeFlags = [ "-DEVHTP_DISABLE_SSL=OFF" "-DEVHTP_BUILD_SHARED=ON" ];