diff --git a/vkd3d-configure-c99.patch b/vkd3d-configure-c99.patch
new file mode 100644
index 0000000..115a75f
--- /dev/null
+++ b/vkd3d-configure-c99.patch
@@ -0,0 +1,19 @@
+Use AC_CHECK_FUNCS to define HAVE_GETTID because VKD3D_CHECK_FUNC
+does not use a fake prototype and does not include <unistd.h>, so
+it always fails with Clang 16 and GCC 14.
+
+Submitted upstream: <https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/528>
+
+diff --git a/configure.ac b/configure.ac
+index 52d233a42c5ed765..5e3f745c062b1c7b 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -144,7 +144,7 @@ VKD3D_CHECK_FUNC([HAVE_SYNC_ADD_AND_FETCH], [__sync_add_and_fetch], [__sync_add_
+ VKD3D_CHECK_FUNC([HAVE_SYNC_SUB_AND_FETCH], [__sync_sub_and_fetch], [__sync_sub_and_fetch((int *)0, 0)])
+ VKD3D_CHECK_FUNC([HAVE_SYNC_BOOL_COMPARE_AND_SWAP], [__sync_bool_compare_and_swap], [__sync_bool_compare_and_swap((int *)0, 0, 0)])
+ VKD3D_CHECK_FUNC([HAVE_ATOMIC_EXCHANGE_N], [__atomic_exchange_n], [__atomic_exchange_n((int *)0, 0, 0)])
+-VKD3D_CHECK_FUNC([HAVE_GETTID], [gettid], [gettid()])
++AC_CHECK_FUNCS([gettid])
+ 
+ dnl Makefiles
+ case $host_os in
diff --git a/vkd3d.spec b/vkd3d.spec
index fb03687..705681f 100644
--- a/vkd3d.spec
+++ b/vkd3d.spec
@@ -1,13 +1,17 @@
 Name:		vkd3d
 Version:	1.9
-Release:	1%{?dist}
+Release:	2%{?dist}
 Summary:	D3D12 to Vulkan translation library
 
 License:	LGPLv2+
 URL:		https://source.winehq.org/git/vkd3d.git
 Source0:	https://dl.winehq.org/vkd3d/source/%{name}-%{version}.tar.xz
 Source1:	https://dl.winehq.org/vkd3d/source/%{name}-%{version}.tar.xz.sign
+Patch0: vkd3d-configure-c99.patch
 
+BuildRequires:  autoconf
+BuildRequires:  automake
+BuildRequires:  libtool
 BuildRequires:	make
 BuildRequires:	bison
 BuildRequires:	flex
@@ -132,12 +136,13 @@ BuildArch:	noarch
 
 
 %prep
-%autosetup
+%autosetup -p1
 mkdir ../mingw-build
 cp -rp . ../mingw-build
 
 
 %build
+autoreconf -iv
 %configure
 %make_build
 
@@ -244,6 +249,9 @@ find %{buildroot} -regextype egrep -regex '.*\.a$|.*\.la$' ! -iname '*.dll.a' -d
 
 
 %changelog
+* Mon Dec 18 2023 Florian Weimer <fweimer@redhat.com> - 1.9-2
+- Fix C compatibility issue in configure script, run autoconf
+
 * Sun Oct 01 2023 - Michael Cronenworth <mike@cchtml.com> - 1.9-1
 - version update