--- /dev/null
+# SPDX-License-Identifier: GPL-2.0-only
+
+AM_CPPFLAGS += -I$(srcdir) -I$(builddir)
+
+noinst_PROGRAMS = filter-grammar-test
+noinst_LTLIBRARIES = libfilter.la
+noinst_HEADERS = filter-ast.h \
+ filter-symbols.h
+
+BUILT_SOURCES = filter-parser.h
+
+libfilter_la_SOURCES = \
+ filter-parser.y filter-lexer.l \
+ filter-visitor-xml.c \
+ filter-visitor-generate-ir.c \
+ filter-visitor-ir-check-binary-op-nesting.c \
+ filter-visitor-ir-validate-string.c \
+ filter-visitor-ir-validate-globbing.c \
+ filter-visitor-ir-normalize-glob-patterns.c \
+ filter-visitor-generate-bytecode.c \
+ filter-ast.h \
+ filter-bytecode.h \
+ filter-ir.h \
+ memstream.h
+libfilter_la_CFLAGS = -include filter-symbols.h $(AM_CFLAGS)
+libfilter_la_LIBADD = $(top_builddir)/src/common/string-utils/libstring-utils.la
+
+AM_YFLAGS = -t -d -v -Wno-yacc
+
+# start with empty files to clean
+CLEANFILES =
+
+if HAVE_BISON
+# we have bison: we can clean the generated parser files
+CLEANFILES += filter-parser.c filter-parser.h filter-parser.output
+else # HAVE_BISON
+# create target used to stop the build if we want to build the parser,
+# but we don't have the necessary tool to do so
+ERR_MSG = "Error: Cannot build target because bison is missing."
+ERR_MSG += "Make sure bison is installed and run the configure script again."
+
+filter-parser.c filter-parser.h: filter-parser.y
+ @echo $(ERR_MSG)
+ @false
+
+all-local: filter-parser.c filter-parser.h
+endif # HAVE_BISON
+
+if HAVE_FLEX
+# we have flex: we can clean the generated lexer files
+CLEANFILES += filter-lexer.c
+else # HAVE_FLEX
+# create target used to stop the build if we want to build the lexer,
+# but we don't have the necessary tool to do so
+ERR_MSG = "Error: Cannot build target because flex is missing."
+ERR_MSG += "Make sure flex is installed and run the configure script again."
+
+filter-lexer.c: filter-lexer.l
+ @echo $(ERR_MSG)
+ @false
+
+all-local: filter-lexer.c
+endif # HAVE_FLEX
+
+filter_grammar_test_SOURCES = filter-grammar-test.c
+filter_grammar_test_LDADD = libfilter.la