https://github.com/telmich/gpm/commit/d88fb1de5803c366ab62f7de9ee5d83207fb2afe
https://github.com/telmich/gpm/commit/4a938233fbe6de7af05aabc74891b68d4bae40f8
https://bugs.gentoo.org/829581

From: Dima Krasner <dima@dimakrasner.com>
Date: Wed, 12 Nov 2014 23:06:46 +0200
Subject: [PATCH] Added musl support to libgpm and the daemon.

--- a/src/daemon/open_console.c
+++ b/src/daemon/open_console.c
@@ -21,6 +21,7 @@
 
 #include <fcntl.h>                  /* open and co.      */
 #include <sys/stat.h>               /* stat()            */
+#include <sys/types.h>              /* major()           */
 #include <sys/ioctl.h>              /* ioctl             */
 
 /* Linux specific (to be outsourced in gpm2 */
--- a/src/prog/display-buttons.c
+++ b/src/prog/display-buttons.c
@@ -36,6 +36,7 @@
 #include <stdio.h>            /* printf()             */
 #include <time.h>             /* time()               */
 #include <errno.h>            /* errno                */
+#include <sys/select.h>       /* fd_set and FD_*      */
 #include <gpm.h>              /* gpm information      */
 
 /* display resulting data */
--- a/src/prog/display-coords.c
+++ b/src/prog/display-coords.c
@@ -38,6 +38,7 @@
 #include <stdio.h>            /* printf()             */
 #include <time.h>             /* time()               */
 #include <errno.h>            /* errno                */
+#include <sys/select.h>       /* fd_set and FD_*      */
 #include <gpm.h>              /* gpm information      */
 
 /* display resulting data */
--- a/src/prog/gpm-root.y
+++ b/src/prog/gpm-root.y
@@ -1199,9 +1199,9 @@ int main(int argc, char **argv)
 #if defined(__GLIBC__)
    __sigemptyset(&childaction.sa_mask);
 #else /* __GLIBC__ */
-   childaction.sa_mask=0;
+   sigemptyset(&childaction.sa_mask);
 #endif /* __GLIBC__ */
-   childaction.sa_flags=SA_INTERRUPT; /* need to break the select() call */
+   childaction.sa_flags=0;
    sigaction(SIGCHLD,&childaction,NULL);
 
    /*....................................... Connect and get your buffer */

From: Kurt Nalty <46026992+kurtnalty@users.noreply.github.com>
Date: Sat, 29 Dec 2018 23:44:24 -0600
Subject: [PATCH 1/4] Update gpm.c

--- a/src/daemon/gpm.c
+++ b/src/daemon/gpm.c
@@ -29,7 +29,7 @@
 #include <signal.h>        /* SIGPIPE */
 #include <time.h>          /* time() */
 #include <sys/param.h>
-#include <sys/fcntl.h>     /* O_RDONLY */
+#include <fcntl.h>         /* O_RDONLY */
 #include <sys/wait.h>      /* wait()   */
 #include <sys/stat.h>      /* mkdir()  */
 #include <sys/time.h>      /* timeval */

From: Kurt Nalty <46026992+kurtnalty@users.noreply.github.com>
Date: Sat, 29 Dec 2018 23:47:17 -0600
Subject: [PATCH 2/4] Add include <string.h>

Added
 line 28, #include <string.h>                 /* strcpy, bzero     */
for musl compilation
--- a/src/daemon/old_main.c
+++ b/src/daemon/old_main.c
@@ -25,6 +25,7 @@
 #include <signal.h>                 /* guess again       */
 #include <errno.h>                  /* guess again       */
 #include <unistd.h>                 /* unlink            */
+#include <string.h>                 /* strcpy, bzero     */
 #include <sys/stat.h>               /* chmod             */
 
 #include <linux/kd.h>               /* linux hd*         */

From: Kurt Nalty <46026992+kurtnalty@users.noreply.github.com>
Date: Sat, 29 Dec 2018 23:52:58 -0600
Subject: [PATCH 3/4] Update liblow.c for musl compatible

Changed #include <sys/fcntl.h>   to    #include <fcntl.h>
Changed SA_NOMASK to SA_NODEFER on lines 176, 367
--- a/src/lib/liblow.c
+++ b/src/lib/liblow.c
@@ -33,7 +33,7 @@
 #include <sys/types.h>     /* socket() */
 #include <sys/socket.h>    /* socket() */
 #include <sys/un.h>        /* struct sockaddr_un */
-#include <sys/fcntl.h>     /* O_RDONLY */
+#include <fcntl.h>     /* O_RDONLY */
 #include <sys/stat.h>      /* stat() */
 
 #ifdef  SIGTSTP         /* true if BSD system */
@@ -173,7 +173,7 @@ static void gpm_suspend_hook (int signum)
   /* Reincarnation. Prepare for another death early. */
   sigemptyset(&sa.sa_mask);
   sa.sa_handler = gpm_suspend_hook;
-  sa.sa_flags = SA_NOMASK;
+  sa.sa_flags = SA_NODEFER;
   sigaction (SIGTSTP, &sa, 0);
 
   /* Pop the gpm stack by closing the useless connection */
@@ -364,7 +364,7 @@ int Gpm_Open(Gpm_Connect *conn, int flag)
 
          /* if signal was originally ignored, job control is not supported */
          if (gpm_saved_suspend_hook.sa_handler != SIG_IGN) {
-            sa.sa_flags = SA_NOMASK;
+            sa.sa_flags = SA_NODEFER;
             sa.sa_handler = gpm_suspend_hook;
             sigaction(SIGTSTP, &sa, 0);
          }

From: Kurt Nalty <46026992+kurtnalty@users.noreply.github.com>
Date: Mon, 31 Dec 2018 18:41:19 -0600
Subject: [PATCH 4/4] Aligned comments

--- a/src/lib/liblow.c
+++ b/src/lib/liblow.c
@@ -29,11 +29,12 @@
 #include <string.h>        /* strncmp */
 #include <unistd.h>        /* select(); */
 #include <errno.h>
+#include <fcntl.h>         /* O_RDONLY */
+
 #include <sys/time.h>      /* timeval */
 #include <sys/types.h>     /* socket() */
 #include <sys/socket.h>    /* socket() */
 #include <sys/un.h>        /* struct sockaddr_un */
-#include <fcntl.h>     /* O_RDONLY */
 #include <sys/stat.h>      /* stat() */
 
 #ifdef  SIGTSTP         /* true if BSD system */