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# Evaluate library
define have_lib
ifeq ($$(strip $$($(1)_LIBS)),)
HAS_$(1) := no
else
HAS_$(1) := yes
endif
endef
# Find library (pkg-config)
define find_lib
$(call find_alt,$(1),$(1),$(2))
endef
# Find library alternative (pkg-config)
define find_alt
ifeq ($$(strip $$($(1)_LIBS)),)
ifneq ($(strip $(3)),)
$(1)_VER := $(shell pkg-config --atleast-version=$(3) $(2) && echo $(3))
endif
ifeq ($(strip $(3)),$$($(1)_VER))
$(1)_CFLAGS := $(shell pkg-config --cflags $(2) --silence-errors)
$(1)_LIBS := $(shell pkg-config --libs $(2) --silence-errors)
endif
endif
$(call have_lib,$(1),$(3))
endef
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