unable to build with clang: ./warnp.c:39:9: error: call to undeclared function 'strdup'

ERROR:  Error installing eth:
        ERROR: Failed to build gem native extension.

    current directory: /usr/local/lib64/ruby/gems/3.1.0/gems/scrypt-3.0.7/ext/scrypt
/usr/bin/ruby31 -I/usr/lib64/ruby/site_ruby/3.1.0 -rrubygems /usr/local/lib64/ruby/gems/3.1.0/gems/rake-13.1.0/exe/rake RUBYARCHDIR\=/usr/local/lib64/ruby/gems/3.1.0/extensions/x86_64-linux/3.1.0/scrypt-3.0.7 RUBYLIBDIR\=/usr/local/lib64/ruby/gems/3.1.0/extensions/x86_64-linux/3.1.0/scrypt-3.0.7
/usr/bin/ruby31 -I/usr/local/lib64/ruby/gems/3.1.0/gems/ffi-compiler-1.0.1/lib/ffi-compiler/fake_ffi -I../../lib/scrypt /usr/local/lib64/ruby/gems/3.1.0/gems/ffi-compiler-1.0.1/lib/ffi-compiler/exporter.rb ../../lib/scrypt/scrypt_ext.rb ./scrypt_ext.h
mkdir -p x86_64-linux
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/crypto_scrypt.o -c ./crypto_scrypt.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/crypto_scrypt_smix.o -c ./crypto_scrypt_smix.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/crypto_scrypt_smix_sse2.o -c ./crypto_scrypt_smix_sse2.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/insecure_memzero.o -c ./insecure_memzero.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/memlimit.o -c ./memlimit.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/scrypt_calibrate.o -c ./scrypt_calibrate.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/scrypt_ext.o -c ./scrypt_ext.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/scryptenc_cpuperf.o -c ./scryptenc_cpuperf.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/sha256.o -c ./sha256.c
clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/warnp.o -c ./warnp.c
./warnp.c:39:9: error: call to undeclared function 'strdup'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   39 |         name = strdup(p);
      |                ^
./warnp.c:39:9: note: did you mean 'strcmp'?
/usr/include/string.h:156:12: note: 'strcmp' declared here
  156 | extern int strcmp (const char *__s1, const char *__s2)
      |            ^
./warnp.c:39:7: error: incompatible integer to pointer conversion assigning to 'char *' from 'int' [-Wint-conversion]
   39 |         name = strdup(p);
      |              ^ ~~~~~~~~~
2 errors generated.
rake aborted!
Command failed with status (1): [clang -fexceptions -O -fno-omit-frame-pointer -fno-strict-aliasing -Wall -std=c99 -msse -msse2 -D_POSIX_C_SOURCE=199309L -fPIC   -o x86_64-linux/warnp.o -c ./warnp.c]
/usr/local/lib64/ruby/gems/3.1.0/gems/ffi-compiler-1.0.1/lib/ffi-compiler/compile_task.rb:133:in `block (2 levels) in define_task!'
/usr/local/lib64/ruby/gems/3.1.0/gems/rake-13.1.0/exe/rake:27:in `<main>'
Tasks: TOP => default => x86_64-linux/libscrypt_ext.so => x86_64-linux/warnp.o
(See full trace by running task with --trace)
q9f / eth.rb

unable to build with clang: ./warnp.c:39:9: error: call to undeclared function 'strdup' #259
