diff --git a/lftp-4.9.2-fedora-c99.patch b/lftp-4.9.2-fedora-c99.patch
new file mode 100644
index 0000000..3e3ec17
--- /dev/null
+++ b/lftp-4.9.2-fedora-c99.patch
@@ -0,0 +1,22 @@
+diff -rup a/configure b/configure
+--- a/configure	2023-02-08 21:27:48.733647760 -0500
++++ b/configure	2023-02-08 21:28:31.201222024 -0500
+@@ -57429,6 +57429,7 @@ else
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ 
++	 #include <stdio.h>
+ 	 int main()
+ 	 {
+ 	    unsigned long long x=0,x1;
+diff -rup a/m4/needtrio.m4 b/m4/needtrio.m4
+--- a/m4/needtrio.m4	2016-02-20 08:57:52.000000000 -0500
++++ b/m4/needtrio.m4	2023-02-08 21:28:13.642571126 -0500
+@@ -9,6 +9,7 @@ AC_DEFUN([LFTP_NEED_TRIO],[
+       else
+ 
+       AC_RUN_IFELSE([AC_LANG_SOURCE([[
++         #include <stdio.h>
+ 	 int main()
+ 	 {
+ 	    unsigned long long x=0,x1;
diff --git a/lftp.spec b/lftp.spec
index 91c3d74..96f2d28 100644
--- a/lftp.spec
+++ b/lftp.spec
@@ -1,7 +1,7 @@
 Summary:	A sophisticated file transfer program
 Name:		lftp
 Version:	4.9.2
-Release:	8%{?dist}
+Release:	9%{?dist}
 License:	GPLv3+
 Source0:	http://lftp.yar.ru/ftp/%{name}-%{version}.tar.xz
 URL:		http://lftp.yar.ru/
@@ -13,6 +13,7 @@ BuildRequires: make
 Patch1:  lftp-4.0.9-date_fmt.patch
 Patch2:  lftp-4.9.2-cdefs.patch
 Patch3:  lftp-4.9.2-gnutls-peers2.patch
+Patch4:  lftp-4.9.2-fedora-c99.patch
 
 %description
 LFTP is a sophisticated ftp/http file transfer program. Like bash, it has job
@@ -37,6 +38,10 @@ Utility scripts for use with lftp.
 %endif
 %patch3 -p1 -b .gnutls-peers2
 
+%patch4 -p1 -b .fedora-c99
+# Avoid trying to re-run autoconf
+touch -r aclocal.m4 configure m4/needtrio.m4
+
 #sed -i.rpath -e '/lftp_cv_openssl/s|-R.*lib||' configure
 sed -i.norpath -e \
 	'/sys_lib_dlsearch_path_spec/s|/usr/lib |/usr/lib /usr/lib64 /lib64 |' \
@@ -100,6 +105,9 @@ desktop-file-install	\
 
 
 %changelog
+* Wed Feb  8 2023 DJ Delorie <dj@redhat.com> - 4.9.2-9
+- Fix C99 compatibility issue
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 4.9.2-8
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild