Fix CMakeLists.txt for Linux compatibility while preserving Windows vcpkg support

CMakeLists.txt

@@ -17,8 +17,16 @@ elseif(UNIX)
 endif()
 
 # Handle dependencies
+if(WIN32)
+    # Windows: Use vcpkg packages
     find_package(cryptopp CONFIG REQUIRED)
     find_package(nlohmann_json CONFIG REQUIRED)
+else()
+    # Linux: Use system packages
+    find_package(PkgConfig REQUIRED)
+    pkg_check_modules(CRYPTOPP REQUIRED libcryptopp)
+    pkg_check_modules(NLOHMANN_JSON REQUIRED nlohmann_json)
+endif()
 
 # Add library sources
 set(SOURCES
@@ -45,17 +53,34 @@ target_include_directories(privatebinapi PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}/include
 )
 
-# Explicitly include vcpkg directories
+# Platform-specific include directories
+if(WIN32)
+    # Windows: Include vcpkg directories
     target_include_directories(privatebinapi PRIVATE
         ${CMAKE_CURRENT_BINARY_DIR}/vcpkg_installed/x64-windows/include
     )
+endif()
 
 # Link dependencies
+if(WIN32)
+    # Windows: Use vcpkg targets
     target_link_libraries(privatebinapi PRIVATE 
         cryptopp::cryptopp
         nlohmann_json::nlohmann_json
         ${PLATFORM_LIBS}
     )
+else()
+    # Linux: Use system libraries
+    target_link_libraries(privatebinapi PRIVATE 
+        ${CRYPTOPP_LIBRARIES}
+        ${NLOHMANN_JSON_LIBRARIES}
+        ${PLATFORM_LIBS}
+    )
+    target_include_directories(privatebinapi PRIVATE
+        ${CRYPTOPP_INCLUDE_DIRS}
+        ${NLOHMANN_JSON_INCLUDE_DIRS}
+    )
+endif()
 
 # Install targets
 install(TARGETS privatebinapi