checking for PURPLE... configure: error: Package requirements (purple) were not met:

Package glib-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `glib-2.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'glib-2.0', required by 'libpurple', not 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 PURPLE_CFLAGS
and PURPLE_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.