can't build gem: possible bug in the tools you use to build with?

[libweirdness]

both snappy & sha3 have the same build failure,
which looks suspicious, eh?

my learning-programming environment is:
aarch64 / Android / Termux / Ubuntu server jammy, aka 22.04 LTS
and Ruby 3.0.2 within.

gem install sha3 produced, on stdout:

1 ERROR:  Error installing sha3:                                                                   
2    ERROR: Failed to build gem native extension.                                                  
3                                                                                                  
4     current directory: /var/lib/gems/3.0.0/gems/sha3-1.0.4/ext/sha3                              
5 /usr/bin/ruby3.0 -I /usr/lib/ruby/vendor_ruby -r ./siteconf20220609-1113-hj7d07.rb extconf.rb    
6 checking for sha3.h... yes                                                                       
7 checking for digest.h... yes                                                                     
8 creating Makefile                                                                                
9                                                                                                 
10 current directory: /var/lib/gems/3.0.0/gems/sha3-1.0.4/ext/sha3                                 
11 make DESTDIR\= clean                                                                            
12                                                                                                 
13 current directory: /var/lib/gems/3.0.0/gems/sha3-1.0.4/ext/sha3                                 
14 make DESTDIR\=
15 compiling KeccakF-1600-reference.c
16 compiling KeccakHash.c                                                                          
17 compiling KeccakSponge.c                                                                        
18 compiling SnP-FBWL-default.c                                                                    
19 compiling digest.c                                                                              
20 compiling displayIntermediateValues.c                                                           
21 compiling sha3.c                                                                                
22 linking shared-object sha3_n.so                                                                 
23                                                                                                 
24 current directory: /var/lib/gems/3.0.0/gems/sha3-1.0.4/ext/sha3                                 
25 make DESTDIR\= install                                                                          
26 make: /usr/bin/mkdir: No such file or directory
27 make: *** [Makefile:202: .sitearchdir.time] Error 127                                           
28
29 make install failed, exit code 2
30                                                                                                 
31 Gem files will remain installed in /var/lib/gems/3.0.0/gems/sha3-1.0.4 for inspection.          
32 Results logged to /var/lib/gems/3.0.0/extensions/aarch64-linux/3.0.0/sha3-1.0.4/gem_make.out

mkdir is in /bin, not in /usr/bin/mkdir, eh?

Salut, Namaste, & Kaizen!

( :

[libweirdness]

@miyucy ( iirc ), of snappy, cracked something,
so this is copy-pasted from the snappy issue-tracker:

I think you've got it!

$ ruby -v -rrbconfig -e "puts RbConfig::CONFIG['MAKEDIRS']"
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [aarch64-linux-gnu]
/usr/bin/mkdir -p

But there IS no mkdir, there!

That needs to get upstream to someone
( meaning you, who actually know what you're doing,
needs to get that to someone : )

$ grep -A 3 -B 3 mkdir $(gem env gemdir)/gems/snappy-0.3.0/ext/Makefile
RM = rm -f
RM_RF = $(RUBY) -run -e rm -- -rf
RMDIRS = rmdir --ignore-fail-on-non-empty -p
MAKEDIRS = /usr/bin/mkdir -p
INSTALL = /usr/bin/install -c
INSTALL_PROG = $(INSTALL) -m 0755
INSTALL_DATA = $(INSTALL) -m 644

again!

---

I think they found the bug is in Ubuntu's system-wide Ruby,
but that is the opinion of an old fool who's trying to learn basic programming,
so you actual-programmers know better whether this is significant,
& to what degree.

Salut, Namaste, & Kaizen!

( :