cmake does not find qt 5.1.1

Question

我刚刚安装了适用于Windows 32位（MinGW 4.8，OpenGL）的Qt 5.1.1，并尝试将其添加到我的cmake中。但是CMake就是不想找到它，我不知道为什么。我错过了什么？我需要设置环境变量或其他东西吗？

这是我的cmake：

cmake_minimum_required( VERSION 2.8.11 )
PROJECT(Blemmer)
# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)
# Detect and add SFML
set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/Modules" ${CMAKE_MODULE_PATH})
set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin )
set( CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib )
find_package(SFML REQUIRED system window graphics network audio)
# The QUIET option disables messages if the package cannot be found. 
FIND_PACKAGE(Qt5Widgets) 
add_subdirectory(Entity)
add_subdirectory(Engine)
add_subdirectory(Game)
add_executable(Blemmer main.cpp)
include_directories(${SFML_INCLUDE_DIR} ${PROJECT_SOURCE_DIR})
target_link_libraries(Blemmer ${SFML_LIBRARIES} Game Engine Qt5::Widgets)

这是 cmake-gui 的输出：

CMake Warning at CMakeLists.txt:14 (FIND_PACKAGE):
  By not providing "FindQt5Widgets.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "Qt5Widgets", but CMake did not find one.
  Could not find a package configuration file provided by "Qt5Widgets" with
  any of the following names:
    Qt5WidgetsConfig.cmake
    qt5widgets-config.cmake
  Add the installation prefix of "Qt5Widgets" to CMAKE_PREFIX_PATH or set
  "Qt5Widgets_DIR" to a directory containing one of the above files.  If
  "Qt5Widgets" provides a separate development package or SDK, be sure it has
  been installed.

Answer 1

我通过导出 Linux 环境变量在 MacOSX 10.10 上成功构建了我的 GUI

$ brew install qt5
$ ls /usr/local/opt/qt5/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake
$ /usr/local/opt/qt5/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake
$ export CMAKE_PREFIX_PATH=/usr/local/opt/qt5/
$ cd ./build
$ cmake ../CMakeLists.txt
$ make -j8

根据 http://www.cmake.org/cmake/help/v3.0/variable/CMAKE_PREFIX_PATH.html，cmake 函数 FIND_LIBRARY（） 将appends /lib to each of the directories。就这样完成了。

Answer 2

您需要

将CMAKE_PREFIX_PATH设置为Qt安装。

见 http://doc.qt.io/qt-5/cmake-manual.html

Answer 3

在

CMakeLists.txt文件中使用以下方法修复了它：

set(CMAKE_PREFIX_PATH $ENV{HOME}/Qt5.5.0/5.5/gcc_64)

对我来说，上下文最终是这样的：

# Ubuntu 14.04 LTS, CMake 2.8.12.2
wget http://download.qt.io/official_releases/qt/5.5/5.5.0/qt-opensource-linux-x64-5.5.0.run
chmod u+x qt-opensource-linux-x64-5.5.0.run
./qt-opensource-linux-x64-5.5.0.run
# Follow GUI prompts, installed to default location