I have mono installed in my RHEL 5 machine which is visible as follows:
which mono
/usr/local/bin/mono
mono -V
Mono JIT compiler version 2.10.2 (tarball Wed Oct 16 10:33:49 CDT 2013) Copyright (C) 2002-2011 Novell, Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: Included Boehm (with typed GC and Parallel Mark)
When i try to run the configure script for xsp, it fails since it could not find mono.
./configure
checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking target system type... x86_64-unknown-linux-gnu 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 whether to enable maintainer-specific portions of Makefiles... no checking for a BSD-compatible install... /usr/bin/install -c checking for gawk... (cached) gawk checking for a thread-safe mkdir -p... /bin/mkdir -p checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking for MONO_MODULE... configure: error: Package requirements (mono >= 2.10.0) were not met:
No package 'mono' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix.
Alternatively, you may set the environment variables MONO_MODULE_CFLAGS and MONO_MODULE_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details.
I tried to resolve this by adding the mono.pc file path to PKG_CONFIG_PATH. export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
But the issue didn't get resolved and i got the same error nonetheless.
Please help me in finding a resolution for this issue.
Try following this guide: Setting up a Build Environment (with MONO_PREFIX=/usr/local and forget about the gnome parts).
Check the correct location of pkgconfig in your mono installation.I was running with the same error until i found that it was under
/Library/Frameworks/Mono.framework/Versions/3.4.0/lib/pkgconfig/
来源：https://stackoverflow.com/questions/19415201/xsp-configure-fails-due-to-mono-module-dependancy