Fix blender detection and build errors on linux

hecl-gui/CMakeLists.txt

@@ -12,6 +12,8 @@ if(APPLE)
   set(PLAT_SRCS MacOSSystemVersion.hpp MacOSSystemVersion.mm)
   find_library(FOUNDATION_LIBRARY Foundation)
   set(PLAT_LIBS ${FOUNDATION_LIBRARY})
+elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
+  set(PLAT_LIBS pthread dl)
 endif()
 
 if(WIN32)

hecl-gui/FindBlender.cpp

@@ -7,6 +7,8 @@ namespace hecl::blender
 
 #ifdef __APPLE__
 #define DEFAULT_BLENDER_BIN "/Applications/Blender.app/Contents/MacOS/blender"
+#elif __linux__
+#define DEFAULT_BLENDER_BIN "/usr/bin/blender"
 #else
 #define DEFAULT_BLENDER_BIN "blender"
 #endif
@@ -87,6 +89,14 @@ hecl::SystemString FindBlender(int& major, int& minor)
                 }
             }
         }
+        else
+        {
+            blenderBin = DEFAULT_BLENDER_BIN;
+            if (!RegFileExists(blenderBin))
+            {
+                blenderBin = nullptr;
+            }
+        }
     }
 #endif