which confused about which mono

I see odd inconsistencies when I run mono from the command line. Does
anyone know what could cause this:

calder@pharos:~/tmp/mono$ mono --version
Mono JIT compiler version 3.2.7 ((no/1b62dca Thu Mar 13 21:13:52 PDT 2014)
...

calder@pharos:~/tmp/mono$ which mono
/usr/bin/mono

calder@pharos:~/tmp/mono$ /usr/bin/mono --version
Mono JIT compiler version 4.1.0 (master/3f87ade Fri May  1 07:50:52 EDT
2015)
...

I get errors installing mono after successfully building it, and I suspect
they are related to the above. Here is the error during sudo make install:

make[7]: Entering directory `/home/calder/tmp/mono/mcs/class/System'
make intermediate=secxml/ ./../../class/lib/basic/secxml/System.dll
make[8]: Entering directory `/home/calder/tmp/mono/mcs/class/System'
MCS     [secxml/basic] System.dll
Corlib not in sync with this runtime: expected corlib version 130, found
128.
Loaded from: /usr/lib/mono/4.5/mscorlib.dll
Download a newer corlib or a newer runtime at
http://www.mono-project.com/download.
make[8]: *** [../../class/lib/basic/secxml/System.dll] Error 1
make[8]: Leaving directory `/home/calder/tmp/mono/mcs/class/System'

Thanks for any help.

Matt

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