fftw: Build variants thread, float and long double

For now we keep them all in the same package, may be split up into
subpackages in the future. Fixes #605.

packages/fftw/build.sh

@@ -1,5 +1,20 @@
 TERMUX_PKG_HOMEPAGE=http://www.fftw.org/
 TERMUX_PKG_DESCRIPTION="Library for computing the Discrete Fourier Transform (DFT) in one or more dimensions"
 TERMUX_PKG_VERSION=3.3.6
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=http://www.fftw.org/fftw-${TERMUX_PKG_VERSION}-pl1.tar.gz
 TERMUX_PKG_SHA256=1ef4aa8427d9785839bc767f3eb6a84fcb5e9a37c31ed77a04e7e047519a183d
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--enable-threads"
+TERMUX_PKG_RM_AFTER_INSTALL="include/fftw*.f*"
+TERMUX_PKG_INCLUDE_IN_DEVPACKAGE="bin/ share/man/"
+
+termux_step_post_make_install() {
+	local feature
+	for feature in float long-double; do
+		make clean
+		TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--enable-threads --enable-$feature"
+		rm -Rf $TERMUX_PKG_TMPDIR/config-scripts
+		termux_step_configure
+		make -j $TERMUX_MAKE_PROCESSES install
+	done
+}