Index: rtengine/dcraw.c
--- rtengine/dcraw.c.orig
+++ rtengine/dcraw.c
@@ -9853,8 +9853,8 @@ int CLASS main (int argc, const char **argv)
   putenv ((char *) "TZ=UTC");
 #endif
 #ifdef LOCALEDIR
-  setlocale (LC_CTYPE, "");
-  setlocale (LC_MESSAGES, "");
+  //setlocale (LC_CTYPE, "");
+  //setlocale (LC_MESSAGES, "");
   bindtextdomain ("dcraw", LOCALEDIR);
   textdomain ("dcraw");
 #endif
Index: rtengine/procparams.cc
--- rtengine/procparams.cc.orig
+++ rtengine/procparams.cc
@@ -7606,7 +7606,7 @@ int ProcParams::save(const Glib::ustring& fname, const
 
 int ProcParams::load(const Glib::ustring& fname, ParamsEdited* pedited)
 {
-    setlocale(LC_NUMERIC, "C");  // to set decimal point to "."
+    //setlocale(LC_NUMERIC, "C");  // to set decimal point to "."
 
     if (fname.empty()) {
         return 1;
causes double free... 

Index: rtengine/rtthumbnail.cc
--- rtengine/rtthumbnail.cc.orig
+++ rtengine/rtthumbnail.cc
@@ -2057,7 +2057,7 @@ bool Thumbnail::readImage (const Glib::ustring& fname)
 
 bool Thumbnail::readData  (const Glib::ustring& fname)
 {
-    setlocale (LC_NUMERIC, "C"); // to set decimal point to "."
+    //setlocale (LC_NUMERIC, "C"); // to set decimal point to "."
     Glib::KeyFile keyFile;
 
     try {
Index: rtexif/rtexif.cc
--- rtexif/rtexif.cc.orig
+++ rtexif/rtexif.cc
@@ -2814,7 +2814,7 @@ void ExifManager::parse (bool isRaw, bool skipIgnored,
         #endif
         return;
     }
-    setlocale (LC_NUMERIC, "C"); // to set decimal point in sscanf
+    //setlocale (LC_NUMERIC, "C"); // to set decimal point in sscanf
 
     if (order == ByteOrder::UNKNOWN) {
         // read tiff header
Index: rtgui/cacheimagedata.cc
--- rtgui/cacheimagedata.cc.orig
+++ rtgui/cacheimagedata.cc
@@ -65,7 +65,7 @@ CacheImageData::CacheImageData() :
  */
 int CacheImageData::load (const Glib::ustring& fname)
 {
-    setlocale(LC_NUMERIC, "C"); // to set decimal point to "."
+    //setlocale(LC_NUMERIC, "C"); // to set decimal point to "."
 
     Glib::KeyFile keyFile;
 
Index: rtgui/multilangmgr.cc
--- rtgui/multilangmgr.cc.orig
+++ rtgui/multilangmgr.cc
@@ -134,8 +134,8 @@ void setGtkLanguage(const Glib::ustring &language)
         lang = lang + ".UTF-8"; // According to Apple documentation, UTF-8 is a built-in encoding on all platforms on which macOS runs
 
         g_setenv("LANG", lang.c_str(), true);
-        setlocale(LC_ALL, lang.c_str());
-        setlocale (LC_NUMERIC, "C"); // Force decimal point to dot.
+        //setlocale(LC_ALL, lang.c_str());
+        //setlocale (LC_NUMERIC, "C"); // Force decimal point to dot.
 
 #else
 
@@ -296,9 +296,9 @@ Glib::ustring MultiLangMgr::getOSUserLanguage ()
 
     // Set locale environment data
     locale = locale + ".UTF-8"; // According to Apple documentation, UTF-8 is a built-in encoding on all platforms on which macOS runs
-    g_setenv("LANG", locale.c_str(), true);
-    setlocale(LC_ALL, locale.c_str());
-    setlocale (LC_NUMERIC, "C"); // Force decimal point to dot.
+    //g_setenv("LANG", locale.c_str(), true);
+    //setlocale(LC_ALL, locale.c_str());
+    //setlocale (LC_NUMERIC, "C"); // Force decimal point to dot.
 
     langName = localeToLang(locale);
     
Index: rtgui/options.cc
--- rtgui/options.cc.orig
+++ rtgui/options.cc
@@ -712,7 +712,7 @@ void Options::filterOutParsedExtensions()
 
 void Options::readFromFile(Glib::ustring fname)
 {
-    setlocale(LC_NUMERIC, "C");  // to set decimal point to "."
+    //setlocale(LC_NUMERIC, "C");  // to set decimal point to "."
 
     Glib::KeyFile keyFile;