--- a/contrib/pg_trgm/trgm_regexp.c
+++ b/contrib/pg_trgm/trgm_regexp.c
@@ -2193,7 +2193,7 @@
 
 	{
 		/* dot -Tpng -o /tmp/source.png < /tmp/source.gv */
-		FILE	   *fp = fopen("/tmp/source.gv", "w");
+		FILE	   *fp = fopen("@TERMUX_PREFIX@/tmp/source.gv", "w");
 
 		fprintf(fp, "%s", buf.data);
 		fclose(fp);
@@ -2255,7 +2255,7 @@
 
 	{
 		/* dot -Tpng -o /tmp/transformed.png < /tmp/transformed.gv */
-		FILE	   *fp = fopen("/tmp/transformed.gv", "w");
+		FILE	   *fp = fopen("@TERMUX_PREFIX@/tmp/transformed.gv", "w");
 
 		fprintf(fp, "%s", buf.data);
 		fclose(fp);
@@ -2346,7 +2346,7 @@
 
 	{
 		/* dot -Tpng -o /tmp/packed.png < /tmp/packed.gv */
-		FILE	   *fp = fopen("/tmp/packed.gv", "w");
+		FILE	   *fp = fopen("@TERMUX_PREFIX@/tmp/packed.gv", "w");
 
 		fprintf(fp, "%s", buf.data);
 		fclose(fp);
--- a/src/bin/pg_ctl/pg_ctl.c
+++ b/src/bin/pg_ctl/pg_ctl.c
@@ -494,7 +494,7 @@
 		cmd = psprintf("exec \"%s\" %s%s < \"%s\" 2>&1",
 					   exec_path, pgdata_opt, post_opts, DEVNULL);
 
-	(void) execl("/bin/sh", "/bin/sh", "-c", cmd, (char *) NULL);
+	(void) execl("@TERMUX_PREFIX@/bin/sh", "@TERMUX_PREFIX@/bin/sh", "-c", cmd, (char *) NULL);
 
 	/* exec failed */
 	write_stderr(_("%s: could not start server: %s\n"),
--- a/src/bin/pg_upgrade/check.c
+++ b/src/bin/pg_upgrade/check.c
@@ -481,7 +481,7 @@
 
 #ifndef WIN32
 	/* add shebang header */
-	fprintf(script, "#!/bin/sh\n\n");
+	fprintf(script, "#!@TERMUX_PREFIX@/bin/sh\n\n");
 #endif
 
 	/* delete old cluster's default tablespace */
--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -3978,7 +3978,7 @@
 	if (result == -1)
 		pg_log_error("could not start editor \"%s\"", editorName);
 	else if (result == 127)
-		pg_log_error("could not start /bin/sh");
+		pg_log_error("could not start @TERMUX_PREFIX@/bin/sh");
 	free(sys);
 
 	return result == 0;
@@ -4020,7 +4020,7 @@
 		const char *tmpdir = getenv("TMPDIR");
 
 		if (!tmpdir)
-			tmpdir = "/tmp";
+			tmpdir = "@TERMUX_PREFIX@/tmp";
 #else
 		char		tmpdir[MAXPGPATH];
 		int			ret;
@@ -5087,7 +5087,7 @@
 
 
 #ifndef WIN32
-#define DEFAULT_SHELL "/bin/sh"
+#define DEFAULT_SHELL "@TERMUX_PREFIX@/bin/sh"
 #else
 /*
  *	CMD.EXE is in different places in different Win32 releases so we
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -206,7 +206,7 @@
  * support them yet.
  */
 #ifndef WIN32
-#define DEFAULT_PGSOCKET_DIR  "/tmp"
+#define DEFAULT_PGSOCKET_DIR  "@TERMUX_PREFIX@/tmp"
 #else
 #define DEFAULT_PGSOCKET_DIR ""
 #endif