pigpio library was recently added into my project dependency but i realized it does not install into staging directory means not installed header and lib for cross compile for other application.
It is only 3 ".h" files that are not being installed in staging. Just adding these 3 lines to pigpio.mk would solve this issue: diff a/package/pigpio.mk b/package/pigpio.mk 22a23,25 > $(INSTALL) -D -m 0644 $(@D)/pigpio.h $(STAGING_DIR)/usr/include/pigpio.h > $(INSTALL) -D -m 0644 $(@D)/pigpiod_if.h $(STAGING_DIR)/usr/include/pigpiod_if.h > $(INSTALL) -D -m 0644 $(@D)/pigpiod_if2.h $(STAGING_DIR)/usr/include/pigpiod_if2.h
I have submitted http://patchwork.ozlabs.org/patch/1147605/ to address this issue.
Fixed by https://git.buildroot.org/buildroot/commit/?id=589b8cb7e2d81067fde9ee4f11acecf8fd677dde. Thanks!