diff --git a/libical-0.46-errors-are-fatal.patch b/libical-0.46-errors-are-fatal.patch
index 4d6e0c6..2abefec 100644
--- a/libical-0.46-errors-are-fatal.patch
+++ b/libical-0.46-errors-are-fatal.patch
@@ -4,6 +4,8 @@ overlefts regarding ICAL_ERRORS_ARE_FATAL preprocessor conditions by correct one
 which simply invalidates "#ifndef" and thus breaks applications like e.g. Zarafa Groupware. More
 details can be found at: https://bugzilla.redhat.com/show_bug.cgi?id=575715
 
+Upstream link: https://sourceforge.net/tracker/?func=detail&aid=3140405&group_id=16077&atid=316077
+
 --- libical-0.46/src/libical/autogenex/ical.h			2010-08-30 22:05:05.000000000 +0200
 +++ libical-0.46/src/libical/autogenex/ical.h.errors-are-fatal	2010-12-19 21:39:10.000000000 +0100
 @@ -3272,7 +3272,7 @@
diff --git a/libical-0.46-mkdir_p.patch b/libical-0.46-mkdir_p.patch
new file mode 100644
index 0000000..71f2144
--- /dev/null
+++ b/libical-0.46-mkdir_p.patch
@@ -0,0 +1,18 @@
+Patch by Robert Scheck <robert@fedoraproject.org> for libical >= 0.46, which removes the unused
+AC_PROG_MKDIR_P macro, because Red Hat Enterprise Linux 4 and 5 (including derivates/downstreams)
+have autoconf < 2.60, which don't support AC_PROG_MKDIR_P. Unfortunately, libical upstream ships
+in libical 0.46 broken configure and Makefile files, thus autoreconf needs to be run downstream.
+The somehow funny thing is, AC_PROG_MKDIR_P doesn't seem to be used anywhere in the source?!
+
+Upstream link: https://sourceforge.net/tracker/?func=detail&aid=3140412&group_id=16077&atid=316077
+
+--- libical-0.46/configure.in					2010-08-30 22:06:25.000000000 +0200
++++ libical-0.46/configure.in.mkdir_p				2010-12-19 22:48:00.000000000 +0100
+@@ -17,7 +17,6 @@
+ AM_PROG_LEX
+ AC_PROG_LN_S
+ AC_PROG_INSTALL
+-AC_PROG_MKDIR_P
+ 
+ dnl Initialize libtool
+ AM_PROG_LIBTOOL
diff --git a/libical.spec b/libical.spec
index 5ec0046..3fda944 100644
--- a/libical.spec
+++ b/libical.spec
@@ -1,13 +1,14 @@
 Summary:	Reference implementation of the iCalendar data type and serialization format
 Name:		libical
 Version:	0.46
-Release:	1%{?dist}
+Release:	2%{?dist}
 License:	LGPLv2 or MPLv1.1
 Group:		System Environment/Libraries
 URL:		http://freeassociation.sourceforge.net/
 Source:		http://downloads.sourceforge.net/freeassociation/%{name}-%{version}.tar.gz
 Patch0:		libical-0.46-icaltimezone.patch
 Patch1:		libical-0.46-errors-are-fatal.patch
+Patch2:		libical-0.46-mkdir_p.patch
 Requires:	tzdata
 BuildRequires:	autoconf, automake, libtool
 BuildRequires:	bison, byacc, flex
@@ -30,7 +31,8 @@ applications that use libical.
 %setup -q
 %patch0 -p1 -b .icaltimezone
 %patch1 -p1 -b .errors-are-fatal
-autoreconf -i
+%patch2 -p1 -b .mkdir_p
+autoreconf -i -f
 
 %build
 %configure --disable-static --enable-reentrant --with-backtrace
@@ -75,6 +77,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_includedir}/%{name}/vobject.h
 
 %changelog
+* Sun Dec 19 2010 Robert Scheck <robert@fedoraproject.org> 0.46-2
+- Added patch to work around upstream's broken AC_PROG_MKDIR_P
+
 * Sun Dec 19 2010 Robert Scheck <robert@fedoraproject.org> 0.46-1
 - Upgrade to 0.46 (#525933, #628893)
 - Fixed race in populating builtin timezone components (#637150)