Build - specify Qt5 for homebrew installation

We don't yet build on Qt6 which is now the default for homebrew.

Author: samaaron

BUILD-MAC.md

@@ -39,7 +39,7 @@ few dependencies:
 
 1. Xcode (12.1+) and command line tools
 2. Homebrew
-3. All other dependencies - Qt (5.15+), CMake (3.18+)
+3. All other dependencies - Qt5 (5.15+), CMake (3.18+)
 
 ### 1.1 Install Xcode
 
@@ -68,7 +68,7 @@ Once you have Homebrew installed, pulling in the rest of the
 dependencies is a couple of lines to execute within a terminal:
 
 ```
-brew install qt cmake
+brew install qt@5 cmake
 
 ```
 

app/gui/qt/CMakeLists.txt

@@ -21,10 +21,10 @@ if((${BUILD_32BIT}) AND (DEFINED ENV{QT_INSTALL_LOCATION32}))
 elseif(DEFINED ENV{QT_INSTALL_LOCATION})
   message(STATUS "Setting prefix to user-defined Qt install location: $ENV{QT_INSTALL_LOCATION}")
   set(CMAKE_PREFIX_PATH $ENV{QT_INSTALL_LOCATION})
-elseif(APPLE AND EXISTS /usr/local/opt/qt5)
+elseif(APPLE AND EXISTS /usr/local/opt/qt@5)
   # Homebrew installs Qt into/usr/local/qt5
-  message(STATUS "Setting prefix to Homebrew's Qt install location: /usr/local/opt/qt5")
-  set(CMAKE_PREFIX_PATH /usr/local/opt/qt5)
+  message(STATUS "Setting prefix to Homebrew's Qt install location: /usr/local/opt/qt@5")
+  set(CMAKE_PREFIX_PATH /usr/local/opt/qt@5)
 endif()
 
 # Qt Setup
@@ -131,7 +131,7 @@ if (APPLE)
     )
   file(
     GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/run-macdeployqt.sh"
-    CONTENT "PATH=$PATH:/usr/local/opt/qt5/bin macdeployqt \"$1\""
+    CONTENT "PATH=$PATH:/usr/local/opt/qt@5/bin macdeployqt \"$1\""
     )
 
   add_custom_command(

app/mac-prebuild.sh

@@ -77,7 +77,7 @@ $RUBY "${SCRIPT_DIR}/server/ruby/bin/qt-doc.rb" -o "${SCRIPT_DIR}/gui/qt/utils/r
 
 echo "Updating GUI translation files..."
 # Use lrelease on PATH if available otherwise assume Qt was installed via homebrew
-PATH=$PATH:/usr/local/opt/qt/bin lrelease "${SCRIPT_DIR}"/gui/qt/lang/*.ts
+PATH=$PATH:/usr/local/opt/qt@5/bin lrelease "${SCRIPT_DIR}"/gui/qt/lang/*.ts
 
 echo "Compiling erlang files..."
 cd "${SCRIPT_DIR}/server/erlang/tau"