Use ETPAN_IN on Linux, and suggest it be set in Makefile.conf

Makefile.conf

@@ -14,6 +14,7 @@ YML_OPTS=--encoding=utf8
 YML_PATH=$(HOME)/yml2
 ASN1C=asn1c
 ASN1C_INCLUDE=/opt/local/share/asn1c
+#ETPAN_IN=$(HOME)
 #LIBGPGME=/opt/local/lib/libgpgme.11.dylib
 
 # C makros (not environment variables) to overwrite:

src/Makefile

@@ -25,7 +25,7 @@ ifeq ($(BUILD_FOR),Linux)
 TARGET=libpEpEngine.so
 LIBGPGME?=libgpgme.so.11
 CC=gcc -std=c99
-CFLAGS?= $(OPTIMIZE) -fPIC -pedantic -DSYSTEM_DB=\"$(SYSTEM_DB)\" \
+CFLAGS?= -I$(ETPAN_IN)/include $(OPTIMIZE) -fPIC -pedantic -DSYSTEM_DB=\"$(SYSTEM_DB)\" \
 	-DSQLITE_THREADSAFE=1 -D_GNU_SOURCE -I../asn.1 $(EXTRAMACROS)
 LDFLAGS?= -L$(ETPAN_IN)/lib -shared -lc -ldl -letpan -lpthread -L../asn.1 -lasn1 -luuid