Adjustments for using opusfile on win32.

README.md

@@ -110,12 +110,17 @@ Additional dependencies:
 * [go 1.18 or newer (32 bit)](https://go.dev/dl/go1.18.9.windows-386.msi)
 * [gcc (32 bit)](https://osdn.net/projects/mingw/)
 
-go and gcc must be in `%PATH%`.
+go and gcc must be in `%PATH%`.  
 
-MSYS make and CMake generator "MSYS Makefiles" are recommended.  
+This is know to work with MSYS make and CMake generator "MSYS Makefiles".  
 The project can be opened using Microsoft Visual Studio 2022.  
 Compiling with MSVC results in an unusable binary. NOT recommended.  
 
+For sending opus in ogg audio files as voice messages, add a static win32 build of opusfile to the prefix path:
+
+    vcpkg.exe install opusfile:x86-mingw-static
+    cmake -G "MSYS Makefiles" -DCMAKE_PREFIX_PATH=wherever/vcpkg/installed/x86-mingw-static ..
+
 ### Installation
 
 * Place the binary in your Pidgin's plugin directory (`~/.purple/plugins` on Linux).

dependencies/win32/CMakeLists.txt

@@ -83,4 +83,23 @@ set(PIXBUF_INCLUDE_DIRS
 set(PIXBUF_LIBRARIES
     ${PIXBUF_LIB}
     PARENT_SCOPE
-)
+)
+
+find_path(OPUSFILE_INCLUDE_DIR opusfile.h PATH_SUFFIXES opus)
+find_path(OGG_INCLUDE_DIR ogg/ogg.h)
+set(OPUSFILE_INCLUDE_DIRS
+    ${OPUSFILE_INCLUDE_DIR}
+    ${OPUSFILE_INCLUDE_DIR}/opus
+    ${OGG_INCLUDE_DIR}
+    PARENT_SCOPE
+)
+
+find_library(OPUSFILE_LIB opusfile)
+find_library(OPUS_LIB opus)
+find_library(OGG_LIB ogg)
+set(OPUSFILE_LIBRARIES
+    ${OPUSFILE_LIB}
+    ${OPUS_LIB}
+    ${OGG_LIB}
+    PARENT_SCOPE
+)