building cdrtools on -current

while building cdrtools there are a bunch of "fatal errors" but without stopping the package to built despite the " | exit 1" at the end the "make ..." line in the cdrtools.SlackBuild.
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In file included from base64.c:2:
config.h:34:10: fatal error: lconfig.h: No such file or directory
34 | #include "lconfig.h"
| ^~~~~~~~~~~
compilation terminated.
==> MAKING DEPENDENCIES "OBJ/intel-r--core-tm--i7-6700-cpu-@-3.40ghz-linux-cc/ioctl.d"
In file included from ioctl.c:2:
config.h:34:10: fatal error: lconfig.h: No such file or directory
34 | #include "lconfig.h"
| ^~~~~~~~~~~
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the package builds, despite it should stop on the "fatal error"???