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@mpento I had to use the --ignore-whitespace flag when invoking "patch" in the PKGBUILD. This may have something to do with the fact that I copy and pasted the patches from your comment.

@vitaliikuzhdin I needed this to build XMMS and ran into the same issue as you have.

clean_exit() is prototyped in esd.c, which is not available to clients.c. I ended up creating two diff patch files, the first removes the clean_exit() prototype from esd.c, the second adds the clean_exit() prototype to esd-server.h.

Since both esd.c and clients.c include esd-server.h, this satisfies the requirement and allows for a successful build.

The caveat here is that I am probably doing this wrong. :-) However, I will provide my solution here, and anyone who knows how to fix this problem correctly please feel free to enlighten me.

file #1: esd.c.patch

--- esd.c.base  2024-09-14 14:05:43.689220498 -0400
+++ esd.c   2024-09-14 14:06:03.852553078 -0400
@@ -67,7 +67,6 @@
 /* esd.c - prototypes */
 void set_audio_buffer( void *buf, esd_format_t format, int magl, int magr,
        int freq, int speed, int length, long offset );
-void clean_exit( int signum );
 void reset_signal( int signum );
 void reset_daemon( int signum );
 void reconnect_driver( int signum );

file #2: esd-server.h.patch

-- esd-server.h.base    2024-09-14 14:05:52.995886818 -0400
+++ esd-server.h    2024-09-14 14:06:39.455885082 -0400
@@ -114,6 +114,7 @@

 /*******************************************************************/
 /* server function prototypes */
+void clean_exit( int signum );

 /* esd.c - global variables */
 extern int esd_is_owned;

finally, add to PKGBUILD:

build() {
  cd "$srcdir/$pkgname-$pkgver"

  # patches to address missing prototype in clients.c
  patch esd.c ../../esd.c.patch
  patch esd-server.h ../../esd-server.h.patch

I hope this is helpful.

gcc -DHAVE_CONFIG_H -I.  -DSYSCONFDIR=\"/etc\" -DSERVERDIR=\"/usr/bin\"    -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -lm -MT clients.o -MD -MP -MF .deps/clients.Tpo -c -o clients.o clients.c
clients.c: In function ‘esd_comm_loop’:
clients.c:282:13: error: implicit declaration of function ‘clean_exit’; did you mean ‘on_exit’? [-Wimplicit-function-declaration]
  282 |             clean_exit(0);
      |             ^~~~~~~~~~
      |             on_exit
make[2]: *** [Makefile:680: clients.o] Error 1
make[2]: Leaving directory '/home/vitalii/.cache/yay/esound/src/esound-0.2.41'
make[1]: *** [Makefile:833: all-recursive] Error 1
make[1]: Leaving directory '/home/vitalii/.cache/yay/esound/src/esound-0.2.41'
make: *** [Makefile:451: all] Error 2

when accessing homepage I'm getting error The requested page "/~ricdude/EsounD.html" could not be found.