Patch-Source: https://github.com/pgexporter/pgexporter/pull/68
--
From 69c328fdde210e2013b9a63e3ce49949ffd2010f Mon Sep 17 00:00:00 2001
From: Jakub Jirutka <jakub@jirutka.cz>
Date: Thu, 25 May 2023 21:36:01 +0200
Subject: [PATCH] Allow building on Linux systems without execinfo.h

musl-based systems, such as Alpine Linux, don't support execinfo.
---
 CMakeLists.txt            | 1 +
 src/CMakeLists.txt        | 5 +++++
 src/libpgexporter/utils.c | 7 +++++--
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 97105bf..da9b55d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,7 @@ message(STATUS "pgexporter ${VERSION_STRING}")
 
 include(CheckCCompilerFlag)
 include(CheckCSourceCompiles)
+include(CheckIncludeFile)
 include(FindPackageHandleStandardArgs)
 include(GNUInstallDirs)
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7667e93..7105baf 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,11 @@ if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
   add_compile_options(-DHAVE_LINUX)
   add_compile_options(-D_POSIX_C_SOURCE=200809L)
 
+  check_include_file("execinfo.h" HAVE_EXECINFO_H)
+  if (HAVE_EXECINFO_H)
+    add_compile_options(-DHAVE_EXECINFO_H)
+  endif()
+
   #
   # Include directories
   #
diff --git a/src/libpgexporter/utils.c b/src/libpgexporter/utils.c
index a627397..f042b11 100644
--- a/src/libpgexporter/utils.c
+++ b/src/libpgexporter/utils.c
@@ -35,7 +35,6 @@
 #include <dirent.h>
 #include <errno.h>
 #include <ev.h>
-#include <execinfo.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <pwd.h>
@@ -50,6 +49,10 @@
 #include <sys/statvfs.h>
 #include <sys/types.h>
 
+#ifdef HAVE_EXECINFO_H
+#include <execinfo.h>
+#endif
+
 #ifndef EVBACKEND_LINUXAIO
 #define EVBACKEND_LINUXAIO 0x00000040U
 #endif
@@ -1992,7 +1995,7 @@ is_wal_file(char* file)
 int
 pgexporter_backtrace(void)
 {
-#ifdef HAVE_LINUX
+#ifdef HAVE_EXECINFO_H
    void* array[100];
    size_t size;
    char** strings;