hello,
I'm aditya. I tried installing desmume today but not able to do so as the below error keeps coming up.

"configure: error: Package requirements ("gtkglext-1.0") were not met:

No package 'gtkglext-1.0' 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 GTKGLEXT_CFLAGS
and GTKGLEXT_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details."

any help will be appreciated.

Welcome to LQ.
That's a missing file /usr/lib/pkgconfig/gtkglext-1.0.pc .
I.e. a "package config file", provided by :

$ sudo apt-get install libgtkglext1-dev

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thank you i could install it
can you tell me how to open it and how to know whether it is really installed?

# 3 .

Install : $ cd desmume-0.9.9/ && sudo make install
Launching : $ desmume
... Or you can use the launcher that might appear in the Menu.
( The launcher file is /usr/local/share/applications/desmume.desktop ).

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thanks a lot