Can't install another version of ruby

[iharkatkavets]

OS:
macOS BigSur 11.1 (20C69)
rbenv 1.1.2-40-g62d7798

I run command to install new version of ruby '$ rbenv install 2.7.2' and I got error

$ rbenv install 2.7.2
Downloading openssl-1.1.1i.tar.gz...
-> https://dqw8nmjcqpjn7.cloudfront.net/e8be6a35fe41d10603c3cc635e93289ed00bf34b79671a3a4de64fcee00d5242
Installing openssl-1.1.1i...
Installed openssl-1.1.1i to /Users/igork/.rbenv/versions/2.7.2

Downloading ruby-2.7.2.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.2.tar.bz2
Installing ruby-2.7.2...
ruby-build: using readline from homebrew

BUILD FAILED (macOS 11.1 using ruby-build 20201225-4-g02ce13c)

Inspect or clean up the working tree at /var/folders/yq/0qgh9s2s3mv9mj8qcr1tndk00000gn/T/ruby-build.20210117184954.54049.ZDBDN6
Results logged to /var/folders/yq/0qgh9s2s3mv9mj8qcr1tndk00000gn/T/ruby-build.20210117184954.54049.log

Last 10 log lines:
linking shared-object openssl.bundle
linking shared-object ripper.bundle
./revision.h unchanged
linking ruby
make[1]: Nothing to be done for `note'.
Generating RDoc documentation
dyld: Library not loaded: /usr/local/opt/gmp/lib/libgmp.10.dylib
Referenced from: /var/folders/yq/0qgh9s2s3mv9mj8qcr1tndk00000gn/T/ruby-build.20210117184954.54049.ZDBDN6/ruby-2.7.2/ruby
Reason: image not found
make: *** [rdoc] Abort trap: 6

Output from log file:

raddrinfo.c:442:41: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'socklen_t' (aka 'unsigned int') [-Wshorten-64-to-32]
return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
~~~~~~~~~~~ ^~~~~~~
raddrinfo.c:442:56: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'socklen_t' (aka 'unsigned int') [-Wshorten-64-to-32]
return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
~~~~~~~~~~~ ^~~~~~~
linking shared-object json/ext/parser.bundle
compiling ifaddr.c
linking shared-object date_core.bundle
compiling ossl_pkey_ec.c
compiling getaddrinfo.c
compiling ossl_pkey_rsa.c
linking shared-object json/ext/generator.bundle
compiling getnameinfo.c
getaddrinfo.c:410:7: warning: add explicit braces to avoid dangling else [-Wdangling-else]
} else if (strcmp(sp->s_proto, "tcp") == 0) {
^
installing default socket libraries
compiling ossl_rand.c
compiling ossl_ssl.c
compiling ossl_ssl_session.c
compiling ossl_x509.c
compiling ossl_x509attr.c
compiling ossl_x509cert.c
compiling ossl_x509crl.c
1 warning generated.
compiling ossl_x509ext.c
compiling ossl_x509name.c
compiling ossl_x509req.c
compiling ossl_x509revoked.c
compiling ossl_x509store.c
2 warnings generated.
linking shared-object socket.bundle
linking shared-object openssl.bundle
linking shared-object ripper.bundle
./revision.h unchanged
linking ruby
make[1]: Nothing to be done for `note'.
Generating RDoc documentation
dyld: Library not loaded: /usr/local/opt/gmp/lib/libgmp.10.dylib
Referenced from: /var/folders/yq/0qgh9s2s3mv9mj8qcr1tndk00000gn/T/ruby-build.20210117184954.54049.ZDBDN6/ruby-2.7.2/ruby
Reason: image not found
make: *** [rdoc] Abort trap: 6

Don't know how to fix the issue. Thank you in advance!

[iharkatkavets]

The issue happens with any version of ruby I select to install

[jaredbeck]

dyld: Library not loaded: /usr/local/opt/gmp/lib/libgmp.10.dylib
Reason: image not found

I fixed this by installing gmp with brew.

Background

It's unclear to me whether gmp is a dependency of ruby or not. It is not mentioned in the ruby-build docs, under
Suggested build environment.

It seems that when ruby is compiled, it will "opportunistically" link against gmp. This can be disabled with the configure script's --without-gmp option. In fact, this is what homebrew's ruby package does, as of Sep. 2019 (Homebrew/homebrew-core#43841)

Looking at the source of bin/ruby-build, the string "gmp" does not appear, so probably @hsbt et. al. have not made an explicit decision about whether to use the --without-gmp option yet.

[apurvis]

having similar issue installing ruby 2.6.6 on big sur 11.6 w/m1 chip, though my last 10 log lines are different. strange because around a month ago i was able to successfully install 2.7.4 via rbenv install.

Last 10 log lines:
6 warnings generated.
compiling ../.././ext/psych/yaml/parser.c
5 warnings generated.
422 warnings generated.
linking shared-object date_core.bundle
4 warnings generated.
linking shared-object zlib.bundle
1 warning generated.
linking shared-object psych.bundle
make: *** [build-ext] Error 2

in the logs i also found this actual error level message:

closure.c:264:14: error: implicit declaration of function 'ffi_prep_closure' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    result = ffi_prep_closure(pcl, cif, callback, (void *)self);

(i already had gmp installed so the fix above does not work for me)

update: seems related to this issue