Add checks for undefined structure elements used IEC 61131-3 source code being compiled.
include common.mk
bin_PROGRAMS = iec2c
SUBDIRS = absyntax absyntax_utils stage1_2 stage3 stage4
ACLOCAL_AMFLAGS=-I config
LDADD = stage1_2/libstage1_2.a \
stage3/libstage3.a \
stage4/libstage4.a \
absyntax/libabsyntax.a \
absyntax_utils/libabsyntax_utils.a
iec2c_SOURCES = main.cc