Add all .capnp files to make dist archive.

Makefile.am

@@ -44,6 +44,11 @@ noinst_HEADERS += \
 	compiler/schema.capnp.h \
 	compiler/c++.capnp.h
 
+# Don't try to generate any *.capnp files. Otherwise make wants to compile them
+# from *.capnp.c and fails.
+%.capnp: ;
+
+# googletest
 GTEST_LDADD = gtest/googletest/lib/libgtest.la
 gtest/googletest/lib/libgtest.la:
 	make -C gtest/googletest lib/libgtest.la
@@ -65,6 +70,10 @@ noinst_HEADERS += \
 	compiler/test.capnp.h \
 	tests/example.capnp.h
 EXTRA_DIST += \
+	compiler/c.capnp \
+	compiler/c++.capnp \
+	compiler/schema.capnp \
+	compiler/test.capnp \
 	tests/example.capnp
 capn_test_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_CPPFLAGS)
 capn_test_CXXFLAGS = -std=gnu++11 -pthread

README.md

@@ -68,6 +68,11 @@ You need to compile these runtime library files and link them into your own proj
 
 Your include path must contain the runtime library directory [`lib`](lib). Header file [`lib/capnp_c.h`](lib/capnp_c.h) contains the public interfaces of the library.
 
+Using make-based builds, make may try to compile `${x}.capnp` from
+`${x}.capnp.c` using its built-in rule for compiling `${y}` from
+`${y}.c`. You can either disable make's built-in compile rules or just
+this specific case with the no-op rule: `%.capnp: ;`.
+
 For further reference, please see the other unit tests in [`tests`](tests), and header file [`lib/capnp_c.h`](lib/capnp_c.h).
 
 The project [`quagga-capnproto`](https://github.com/opensourcerouting/quagga-capnproto) uses `c-capnproto` and contains some good examples, as found with [this github repository search](https://github.com/opensourcerouting/quagga-capnproto/search?utf8=%E2%9C%93&q=capn&type=):

compiler/c.capnp

@@ -29,6 +29,10 @@ annotation nameinfix @0x85a8d86d736ba637 (file): Text;
 # to a loop.  $nameinfix (recommended parameter: "-gen") inserts its parameter
 # before the ".c", so the filename becomes "foo-gen.c"
 #
+# Alternatively, add this Makefile rule to disable compiling "foo.capnp.c" -> "foo.capnp":
+#   %.capnp: ;
+#
+#
 # ("foo" is really "foo.capnp", so it's foo.capnp-gen.c)
 
 annotation fieldgetset @0xf72bc690355d66de (file): Void;