diff --git a/FreeSOLID.spec b/FreeSOLID.spec
index 1197368..63ff5af 100644
--- a/FreeSOLID.spec
+++ b/FreeSOLID.spec
@@ -1,6 +1,6 @@
 Name:           FreeSOLID
 Version:        2.1.1
-Release:        38%{?dist}
+Release:        39%{?dist}
 Summary:        3D collision detection C++ library
 License:        LGPLv2+
 URL:            http://sourceforge.net/projects/freesolid/
@@ -28,7 +28,7 @@ BuildRequires:  automake
 BuildRequires:  libtool
 BuildRequires:  SDL-devel
 BuildRequires:  qhull-devel
-BuildRequires: make
+BuildRequires:  make
 
 
 %description
@@ -55,9 +55,11 @@ Libraries and header files for developing applications that use %{name}.
 %patch3 -p1
 %patch4 -p1
 %patch5 -p1
-%patch6 -p1
+#%%patch6 -p1
 %patch7 -p1
 %patch8 -p1
+mv configure.in configure.ac
+autoupdate
 
 %if 0%{?fedora} > 24
 # check for libqhull/qhull_a.h instead of qhull/qhull_a.h
@@ -71,7 +73,7 @@ chmod 755 configure
 
 
 %build
-autoreconf -i
+autoreconf -fvi
 %configure --disable-static
 make %{?_smp_mflags}
 
@@ -96,6 +98,9 @@ rm -rf sample/*.o sample/.libs $(find sample -type f -a -executable)
 %{_includedir}/*
 
 %changelog
+* Wed Apr 14 2021 Martin Gansser <martinkg@fedoraproject.org> - 2.1.1-39
+- Fix FTBFS (BZ#1943075) with Autoconf 2.71
+
 * Mon Jan 25 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-38
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild