upstream: https://gitlab.com/free-astro/siril/-/issues/1241

diff --git a/src/io/avi_pipp/pipp_utf8.h b/src/io/avi_pipp/pipp_utf8.h
index 33fafc6..f01467f 100644
--- a/src/io/avi_pipp/pipp_utf8.h
+++ b/src/io/avi_pipp/pipp_utf8.h
@@ -31,27 +31,15 @@
 #endif
 
 // 64-bit fseek for various platforms
-#ifdef __linux__
-#define fseek64 fseeko64  // Linux
-#define ftell64 ftello64  // Linux
-#elif defined (OS_OSX)
-#define fseek64 fseeko  // OS X
-#define ftell64 ftello  // OS X
-#elif defined(BSD)
-#define fseek64 fseeko  // DragonFly BSD, FreeBSD, OpenBSD, NetBSD
-#define ftell64 ftello  // DragonFly BSD, FreeBSD, OpenBSD, NetBSD
-#elif defined (__FreeBSD_kernel__) && defined (__GLIBC__)
-#define fseek64 fseeko64  // KFreeBSD
-#define ftell64 ftello64  // KFreeBSD
-#elif defined (__gnu_hurd__)
-#define fseek64 fseeko64  // GNU/Hurd
-#define ftell64 ftello64  // GNU/Hurd
-#elif defined(__CYGWIN__)
-#define fseek64 fseeko  // CYGWIN
-#define ftell64 ftello  // CYGWIN
-#else
+#if defined(__GLIBC__) || defined(__gnu_hurd__)
+#define fseek64 fseeko64  // GNU
+#define ftell64 ftello64  // GNU
+#elif defined(_WIN32)
 #define fseek64 _fseeki64  // Windows
 #define ftell64 _ftelli64  // Windows
+#else // POSIX
+#define fseek64 fseeko  // OS X, DragonFly BSD, FreeBSD, OpenBSD, NetBSD, musl
+#define ftell64 ftello  // OS X, DragonFly BSD, FreeBSD, OpenBSD, NetBSD, musl
 #endif
 
 #endif  // PIPP_UTF8_H