Windows: install step installs in C:\

[nidefawl]

Right now the install step on windows copies files to the root of your file system.

CMAKE_INSTALL_PREFIX is ignored for all files but the lib.
That is because CMAKE_INSTALL_* variables are empty.

This has to do with:

kissfft/CMakeLists.txt

Lines 104 to 110 in 8f47a67

	#
	# Add GNUInstallDirs for GNU infrastructure before target)include_directories
	#
	if(CMAKE_SYSTEM_NAME MATCHES "^(Linux|kFreeBSD|GNU)$" AND NOT CMAKE_CROSSCOMPILING)
	include(GNUInstallDirs)
	endif()

GNUInstallDirs should be included unconditionally. That is what most projects do. See glfw, portaudio, SQLiteCPP.

Otherwise one cannot use the install step on windows.