[R-SIG-Mac] bzip2 configure error

[Duncan Murdoch]

I'm trying to build R-devel in Catalina for the first time in a few 
weeks, and configure is dying with this error:

  checking whether bzip2 support suffices... configure: error: bzip2 
library and headers are required

I tried a Homebrew install of bzip2, and it didn't help.

When I look in config.log, I see this:


configure:45424: checking if bzip2 version >= 1.0.6
configure:45452: gcc -o conftest  -g -O2 -I/usr/local/opt/libffi/include 
  -L/usr/local/opt/libffi/lib conftest.c -lbz2 -lz -licucore -ldl -lm 
-liconv >&5
conftest.c:250:11: warning: initializing 'char *' with an expression of 
type 'const char *' discards qualifiers 
[-Wincompatible-pointer-types-discards-qualifiers]
     char *ver = BZ2_bzlibVersion();
           ^     ~~~~~~~~~~~~~~~~~~
conftest.c:251:5: error: implicitly declaring library function 'exit' 
with type 'void (int) __attribute__((noreturn))' 
[-Werror,-Wimplicit-function-declaration]
     exit(strcmp(ver, "1.0.6") < 0);
     ^
conftest.c:251:5: note: include the header <stdlib.h> or explicitly 
provide a declaration for 'exit'
conftest.c:251:10: error: implicitly declaring library function 'strcmp' 
with type 'int (const char *, const char *)' 
[-Werror,-Wimplicit-function-declaration]
     exit(strcmp(ver, "1.0.6") < 0);
          ^
conftest.c:251:10: note: include the header <string.h> or explicitly 
provide a declaration for 'strcmp'
1 warning and 2 errors generated.


Suggestions for fixing this?

Duncan Murdoch