Update cheatsheets

tldr/linux/qmake

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# qmake
+
+> Generate Makefiles from Qt project files.
+> More information: <https://doc.qt.io/qt-6/qmake-manual.html>.
+
+- Generate a `Makefile` from a project file in the current directory:
+
+`qmake`
+
+- Specify `Makefile` and project file locations:
+
+`qmake -o {{path/to/Makefile}} {{path/to/project_file.pro}}`
+
+- Generate a default project file:
+
+`qmake -project`
+
+- Compile a project:
+
+`qmake && make`
+
+- Enable debug mode:
+
+`qmake -d`