[MonoDevelop] can't install monodevelop 1.9.1 after installed mono 2.4 preview2

[eric han]

Hi
I installed mono 2.4 from source code, and wrote a simple "hello world"
program to test it. It seems work fine.
I want to install monodevelop 1.9.1 from source, after running
"./configure", the console print a error message:
[root at erictoshibafc10 package]# cd monodevelop-1.9.1
[root at erictoshibafc10 monodevelop-1.9.1]# ./configure --prefix=`pkg-config
--variable=prefix mono`
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking how to create a ustar tar archive... gnutar
checking whether to enable maintainer-specific portions of Makefiles... no
checking for mono... /usr/local/bin/mono
checking for gmcs... /usr/local/bin/gmcs
checking for update-mime-database... /usr/bin/update-mime-database
checking for update-desktop-database... /usr/bin/update-desktop-database
checking for pkg-config... /usr/bin/pkg-config
checking for msgfmt... /usr/bin/msgfmt
checking for msgmerge... /usr/bin/msgmerge
checking pkg-config is at least version 0.9.0... yes
checking for UNMANAGED_DEPENDENCIES_MONO... no
configure: error: Please install mono version 2.0 or later to install
MonoDevelop.

But I found these in configure.in:
MONO_REQUIRED_VERSION=2.0
PKG_CHECK_MODULES(UNMANAGED_DEPENDENCIES_MONO,mono >=
$MONO_REQUIRED_VERSION, has_mono=true, has_mono=false)

if test "x$has_mono" = "xfalse"; then
      AC_MSG_ERROR([Please install mono version $MONO_REQUIRED_VERSION or
later to install MonoDevelop.
Please see http://www.mono-project.org/ to download latest mono sources or
packages])
fi

It seems that the monodevelop can't get the mono's actual version. I also
run "mono -V" and it prints 2.4.
Some ideas on that? Really appreciate for help.

eric
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