POPT_LIBS and POPT_CFLAGS ignored by configure and the build
With LTTng-tools 2.10.x
Setting the POPT_LIBS variable is ignored, the configure always checks for '-lpopt' instead of the value specified in POPT_LIBS.
The POPT_CFLAGS options are not added in the compiler options, resulting in '<popt.h>' file not found exceptions.
BTW: The libxml2_LIBS and libxml2_CFLAGS are handled correctly