building mp from source with readline fails (uses files from existing installation)

[mojca (Mojca Miklavec)]

On a machine with an existing MP installation I tried to set up a parallel test installation with

./configure --prefix="$PREFIX" --with-frameworks-dir="$PREFIX/Library/Frameworks" --with-applications-dir="$PREFIX/Applications" --enable-readline

but the build failed with:

clang -c -DUSE_TCL_STUBS -DTCL_NO_DEPRECATED -g -O2 -std=c99 -Wextra -Wall -pedantic  -I/opt/local/include   -DHAVE_CONFIG_H -I/path/to/MacPorts-2.3.4/src -I/path/to/MacPorts-2.3.4/src -I. -I/path/to/MacPorts-2.3.4/vendor/vendor-destroot//opt/test-local/libexec/macports/include -fno-common readline.c -o readline.o
readline.c:130:23: error: use of undeclared identifier 'username_completion_function'; did you mean 'rl_username_completion_function'?
                                        generator_func = USERNAME_COMPLETION_FUNCTION;
                                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                         rl_username_completion_function
readline.c:51:39: note: expanded from macro 'USERNAME_COMPLETION_FUNCTION'
#       define USERNAME_COMPLETION_FUNCTION     username_completion_function
                                                ^
/opt/local/include/readline/readline.h:457:14: note: 'rl_username_completion_function' declared here
extern char *rl_username_completion_function PARAMS((const char *, int));
             ^
1 error generated.
make[2]: *** [readline.o] Error 1
make[1]: *** [all] Error 1
make: *** [all] Error 1

I have no time to debug this right now, so I wanted to note it down before I forget.

[ryandesign (Ryan Carsten Schmidt)]

I'm not sure why the build with readline would fail, but I personally run export PATH=/usr/bin:/bin:/usr/sbin:/sbin before building MacPorts from source to avoid these kinds of problems.

[neverpanic (Clemens Lang)]

That happens when configuring with an existing copy of MacPorts (that has readline installed) in $PATH, which is why you should not do this.

See also ​https://guide-origin.macports.org/#installing.macports.source.multiple, which explicitly documents this. I think this should be closed invalid.

[mojca (Mojca Miklavec)]

Thank you. I wasn't sure whether there were supposed to be any measures to give priority to the built-in readline and I didn't have any time to investigate, but I'm happily closing this as invalid.