test_up_PLIB_LIBS = -lplibsg -lplibul
endif
-est_epsilon_SOURCES = est-epsilon.c
+est_epsilon_SOURCES = est-epsilon.cxx
est_epsilon_LDADD = $(opengl_LIBS)
-gl_info_SOURCES = gl-info.c
+gl_info_SOURCES = gl-info.cxx
gl_info_LDADD = $(opengl_LIBS)
al_info_SOURCES = al-info.c