The system env variable 'PATH' seems to be overwritten in Qgis, replacing it with their own values. Not sure if it was intended or not.
Anyway in version 2.2, I could solve it by go into settings and appending the PATH variable with the values copied from system properties => environment variables.
Apparently for version 2.4, the above solution does not work anymore and Qgis will always overwrite the PATH variable with their own values.
I needed the PATH variable as my project requires the execution of external programs from Qgis by making use of python subprocess module. Now in v2.4, external programs cannot be executed. I do not wish to define absolute path for all the external programs as the project will frequently be ported to different systems.
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