+BUILDDIR ?= build
+variant ?= debug# Different libfirm variants (debug, optimize, profile)
+
+# Use libfirm subdir if it exists, otherwise use pkg-config
+ifneq ("$(wildcard libfirm)", "")
+FIRM_HOME ?= libfirm
+FIRM_CPPFLAGS ?= -I$(FIRM_HOME)/include
+FIRM_LIBS ?= -lm
+LIBFIRM_FILE_BASE ?= build/$(variant)/libfirm.a
+LIBFIRM_FILE ?= $(FIRM_HOME)/$(LIBFIRM_FILE_BASE)
+else
+FIRM_CPPFLAGS ?= `pkg-config --cflags libfirm`
+FIRM_LIBS ?= `pkg-config --libs libfirm`
+LIBFIRM_FILE =
+endif