Add support for CMake

.gitignore

@@ -45,3 +45,4 @@ tools/fft_int16_t
 tools/fft_int32_t
 tools/fft_simd
 test/test_simd
+build

.travis.yml

@@ -14,6 +14,14 @@ addons:
 
 install: true
 
-script:
-  - make all
-  - make testall
+jobs:
+  include:
+    - name: "build (make)"
+      script:
+      - make all
+      - make testall
+    - name: "build (cmake)"
+      script:
+      - mkdir build && cd build
+      - cmake ..
+      - make

CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 2.8)
+project(kissfft)
+
+add_library(kissfft
+  kiss_fft.c)
+
+target_include_directories(kissfft PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+    $<INSTALL_INTERFACE:.>)