Cannot install puma gem

[wickahead]

Trying to install Puma gem (and it fails). Any help is appreciated (wouldn't be surprised if user error...)

Working on my own Mac as a dev machine (learning Rails)
Running macOS 10.15.6 (Catalina)

ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin19]

gem install puma
...fails due to permission (should it?). I then try:
sudo gem install puma
...which gives me the following warnings and errors:

markwicker@Marks20cBookPro ~ % sudo gem install puma
Password:
Building native extensions. This could take a while...
ERROR: Error installing puma:
ERROR: Failed to build gem native extension.

current directory: /Users/markwicker/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/puma-4.3.5/ext/puma_http11

/Users/markwicker/.rbenv/versions/2.6.3/bin/ruby -I /Users/markwicker/.rbenv/versions/2.6.3/lib/ruby/2.6.0 -r ./siteconf20200805-854-1bd435e.rb extconf.rb
checking for BIO_read() in -lcrypto... yes
checking for SSL_CTX_new() in -lssl... yes
checking for openssl/bio.h... yes
checking for DTLS_method() in openssl/ssl.h... yes
checking for TLS_server_method() in openssl/ssl.h... yes
checking for SSL_CTX_set_min_proto_version in openssl/ssl.h... yes
creating Makefile

current directory: /Users/markwicker/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/puma-4.3.5/ext/puma_http11
make "DESTDIR=" clean

current directory: /Users/markwicker/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/puma-4.3.5/ext/puma_http11
make "DESTDIR="
compiling http11_parser.c
ext/puma_http11/http11_parser.c:44:18: warning: unused variable 'puma_parser_en_main' [-Wunused-const-variable]
static const int puma_parser_en_main = 1;
^
1 warning generated.
compiling io_buffer.c
compiling mini_ssl.c
mini_ssl.c:145:7: warning: unused variable 'min' [-Wunused-variable]
int min, ssl_options;
^
mini_ssl.c:299:40: warning: function 'raise_error' could be declared with attribute 'noreturn' [-Wmissing-noreturn]
void raise_error(SSL* ssl, int result) {
^
2 warnings generated.
compiling puma_http11.c
puma_http11.c:203:22: error: implicitly declaring library function 'isspace' with type 'int (int)' [-Werror,-Wimplicit-function-declaration]
while (vlen > 0 && isspace(value[vlen - 1])) vlen--;
^
puma_http11.c:203:22: note: include the header <ctype.h> or explicitly provide a declaration for 'isspace'
1 error generated.
make: *** [puma_http11.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/markwicker/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/puma-4.3.5 for inspection.
Results logged to /Users/markwicker/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/extensions/x86_64-darwin-19/2.6.0/puma-4.3.5/gem_make.out

[MSP-Greg]

@wickahead

First of all, the warnings are normal. Puma '5.x' branch is currently prerelease, which may cause issues with other software you're using. But, the following should work, which will install 5.0.0.beta1.

Otherwise, a patch needs to be added to 4.x builds for installing on macOS/darwin, or it needs to be installed via Bundler using a git source based on PR #2314

gem install puma --prerelease

[dentarg]

@wickahead see comments #2304 (comment) and #2304 (comment) for a workaround

[wickahead]

Thank you both for your responses. Comment #2304

@wickahead see comments #2304 (comment) and #2304 (comment) for a workaround

That did the trick! Thank you!