diff --git a/fltk.spec b/fltk.spec
index 9c2f775..a50100e 100644
--- a/fltk.spec
+++ b/fltk.spec
@@ -65,6 +65,7 @@ BuildRequires: pkgconfig(xext) pkgconfig(xinerama) pkgconfig(xft) pkgconfig(xt)
 BuildRequires: pkgconfig(xproto)
 BuildRequires: xorg-x11-utils
 BuildRequires: zlib-devel
+BuildRequires: autoconf
 
 %description
 FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit.