Pd externals: Don't use std::filesystem

... to support macos < 10.15

.github/workflows/pd-externals.yml

@@ -41,8 +41,6 @@ jobs:
 
   macos:
     runs-on: macos-latest
-    env:
-      cflags: -mmacosx-version-min=10.9
     steps:
       - name: install macOS packages
         run: |

flext/Makefile

@@ -14,7 +14,7 @@ cflags += \
        -DNDEBUG \
 
 define forDarwin
-  cflags += -mmacosx-version-min=10.15
+  cflags += -mmacosx-version-min=10.9
 endef
 
 ldlibs = -lfftw3f -lsndfile -lmysofa `$(PKG_CONFIG) --libs libxml-2.0`

flext/ssr_brs~.cpp

@@ -51,7 +51,7 @@ class SsrFlext<ssr::BrsRenderer> : public SsrFlextBase<ssr::BrsRenderer>
         }
         std::string file_name = _get(argc, argv);
         apf::parameter_map params;
-        params.set("properties-file", (_canvasdir / file_name).string());
+        params.set("properties-file", _canvasdir + "/" + file_name);
         auto id = _engine.add_source("", params);
         _engine.get_source(id)->active = true;
         _source_ids.push_back(id);

flext/ssr_flext.h

@@ -30,7 +30,6 @@
 #ifndef SSR_FLEXT_H
 #define SSR_FLEXT_H
 
-#include <filesystem>
 #include <string>
 #include <vector>
 
@@ -122,7 +121,7 @@ class SsrFlextBase : public flext_dsp
 
   protected:
     // NB: This has to be called before _update_params()!
-    std::filesystem::path _init_canvasdir()
+    std::string _init_canvasdir()
     {
       char buf[MAXPDSTRING];
       this->GetCanvasDir(buf, sizeof(buf));
@@ -135,7 +134,7 @@ class SsrFlextBase : public flext_dsp
       {
         if (params.has_key(key))
         {
-          params.set(key, (_canvasdir / params.get<std::string>(key)).string());
+          params.set(key, _canvasdir + "/" + params.get<std::string>(key));
         }
       }
 
@@ -554,7 +553,7 @@ class SsrFlextBase : public flext_dsp
     }
 
   protected:
-    std::filesystem::path _canvasdir;
+    std::string _canvasdir;
     Renderer _engine;
     std::vector<std::string> _source_ids;
 };