Bug #21676: make[2]: *** No rule to make target '../../../.././ext/-test-/namespace/yay1/yay1.h', needed by 'yay1.o'. Stop.

• Status: Open
• Assignee: -
• Target version: 4.0
• ruby -v: ruby 3.5.0dev (2025-11-02T10:22:22Z master bd51b20c50) +PRISM [x86_64-linux] last_commit=minor code allignment (related to bug 21559)
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[duerst (Martin Dürst)]

When I tried to compile Ruby with make up; make, I got the message in the Subject.
This seems similar to bug #19481, but the various kinds of advice (./config.status or ./autogen.sh; ./configure; make) given there didn't solve the problem.

The last part of the output is

compiling memory_view.c
linking shared-object -test-/memory_view.so
make[2]: Leaving directory '/home/duerst/34ruby/ext/-test-/memory_view'
make[2]: Entering directory '/home/duerst/34ruby/ext/-test-/method'
compiling arity.c
compiling init.c
linking shared-object -test-/method.so
make[2]: Leaving directory '/home/duerst/34ruby/ext/-test-/method'
make[2]: Entering directory '/home/duerst/34ruby/ext/-test-/namespace/yay1'
make[2]: *** No rule to make target '../../../.././ext/-test-/namespace/yay1/yay1.h', needed by 'yay1.o'.  Stop.
make[2]: Leaving directory '/home/duerst/34ruby/ext/-test-/namespace/yay1'
make[1]: *** [exts.mk:197: ext/-test-/namespace/yay1/all] Error 2
make[1]: Leaving directory '/home/duerst/34ruby'
make: *** [uncommon.mk:351: build-ext] Error 2

[nagachika (Tomoyuki Chikanaga)]

I just run into the same problem now.
In my environment, removing exts.mk in build directory resolved the issue.

[nobu (Nobuyoshi Nakada)]

Yes, it is a known issue.
It is possible to avoid by comparing the extension library path list each time, but moving extension library path is quite rare case.