libassuan build failure on macOS 15.1.1

[Robert J. Hansen]

The latest libassuan is failing to build on macOS 15.1.1. I already have 
a recent GnuPG installed from Homebrew, but wanted to look at 2.5.2.

Configuration flags used: --enable-static
Compiler info:
	Apple clang version 16.0.0 (clang-1600.0.26.4)
	Target: arm64-apple-darwin24.1.0
	Thread model: posix
Output:

/bin/sh ../libtool  --tag=CC   --mode=link gcc  -g -O2 -Wall 
-Wcast-align -Wshadow -Wstrict-prototypes -Wpointer-arith 
-version-info 9:1:0  -o libassuan.la -rpath /usr/local/lib 
libassuan_la-assuan.lo libassuan_la-context.lo libassuan_la-system.lo 
libassuan_la-debug.lo libassuan_la-conversion.lo 
libassuan_la-sysutils.lo libassuan_la-client.lo libassuan_la-server.lo 
libassuan_la-assuan-error.lo libassuan_la-assuan-buffer.lo 
libassuan_la-assuan-handler.lo libassuan_la-assuan-inquire.lo 
libassuan_la-assuan-listen.lo libassuan_la-assuan-pipe-server.lo 
libassuan_la-assuan-socket-server.lo libassuan_la-assuan-pipe-connect.lo 
libassuan_la-assuan-socket-connect.lo libassuan_la-assuan-uds.lo 
libassuan_la-assuan-logging.lo libassuan_la-assuan-socket.lo 
libassuan_la-system-posix.lo libassuan_la-assuan-io.lo  memrchr.lo 
-L/opt/homebrew/opt/libgpg-error/lib -lgpg-error
libtool: link: gcc -dynamiclib -Wl,-undefined -Wl,dynamic_lookup -o 
.libs/libassuan.9.dylib  .libs/libassuan_la-assuan.o 
.libs/libassuan_la-context.o .libs/libassuan_la-system.o 
.libs/libassuan_la-debug.o .libs/libassuan_la-conversion.o 
.libs/libassuan_la-sysutils.o .libs/libassuan_la-client.o 
.libs/libassuan_la-server.o .libs/libassuan_la-assuan-error.o 
.libs/libassuan_la-assuan-buffer.o .libs/libassuan_la-assuan-handler.o 
.libs/libassuan_la-assuan-inquire.o .libs/libassuan_la-assuan-listen.o 
.libs/libassuan_la-assuan-pipe-server.o 
.libs/libassuan_la-assuan-socket-server.o 
.libs/libassuan_la-assuan-pipe-connect.o 
.libs/libassuan_la-assuan-socket-connect.o 
.libs/libassuan_la-assuan-uds.o .libs/libassuan_la-assuan-logging.o 
.libs/libassuan_la-assuan-socket.o .libs/libassuan_la-system-posix.o 
.libs/libassuan_la-assuan-io.o .libs/memrchr.o 
-L/opt/homebrew/opt/libgpg-error/lib -lgpg-error  -O2   -install_name 
/usr/local/lib/libassuan.9.dylib -compatibility_version 10 
-current_version 10.1
duplicate symbol '___sputc' in:
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-server.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-conversion.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-sysutils.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-error.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-context.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-debug.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-handler.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-socket-server.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-logging.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-socket-connect.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-system.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-io.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-system-posix.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-inquire.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-buffer.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-pipe-server.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-uds.o
     /Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-client.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-listen.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-pipe-connect.o
  
/Users/rjh/Downloads/libassuan-3.0.1/src/.libs/libassuan_la-assuan-socket.o
ld: 1 duplicate symbols
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)
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