diff --git a/package/fftw/fftw.mk b/package/fftw/fftw.mk
index b167a2f6f7..8b76b7c190 100644
--- a/package/fftw/fftw.mk
+++ b/package/fftw/fftw.mk
@@ -12,38 +12,40 @@ FFTW_LICENSE_FILES = COPYING
 
 # fortran support only enables generation and installation of fortran sources
 ifeq ($(BR2_TOOLCHAIN_HAS_FORTRAN),y)
-FFTW_CONF_OPTS += --enable-fortran
-FFTW_CONF_ENV += FLIBS="-lgfortran -lm"
+FFTW_COMMON_CONF_OPTS += --enable-fortran
+FFTW_COMMON_CONF_ENV += FLIBS="-lgfortran -lm"
 else
-FFTW_CONF_OPTS += --disable-fortran
+FFTW_COMMON_CONF_OPTS += --disable-fortran
 endif
 
-FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_SINGLE),--enable,--disable)-single
-FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE),--enable,--disable)-long-double
-FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_QUAD),--enable,--disable)-quad-precision
-
-FFTW_CFLAGS = $(TARGET_CFLAGS)
+FFTW_COMMON_CFLAGS = $(TARGET_CFLAGS)
 ifeq ($(BR2_PACKAGE_FFTW_FAST),y)
-FFTW_CFLAGS += -O3 -ffast-math
+FFTW_COMMON_CFLAGS += -O3 -ffast-math
 endif
 
 # x86 optimisations
-FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE),--enable,--disable)-sse
-FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE2),--enable,--disable)-sse2
+FFTW_COMMON_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE),--enable,--disable)-sse
+FFTW_COMMON_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE2),--enable,--disable)-sse2
 
 # ARM optimisations
-FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),--enable,--disable)-neon
-FFTW_CFLAGS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),-mfpu=neon)
+FFTW_COMMON_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),--enable,--disable)-neon
+FFTW_COMMON_CFLAGS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),-mfpu=neon)
 
 # Generic optimisations
 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
-FFTW_CONF_OPTS += --enable-threads
-FFTW_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--without,--with)-combined-threads
+FFTW_COMMON_CONF_OPTS += --enable-threads
+FFTW_COMMON_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--without,--with)-combined-threads
 else
-FFTW_CONF_OPTS += --disable-threads
+FFTW_COMMON_CONF_OPTS += --disable-threads
 endif
-FFTW_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--enable,--disable)-openmp
+FFTW_COMMON_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--enable,--disable)-openmp
 
-FFTW_CONF_OPTS += CFLAGS="$(FFTW_CFLAGS)"
+FFTW_CONF_ENV = $(FFTW_COMMON_CONF_ENV)
+FFTW_CONF_OPTS += \
+	$(FFTW_COMMON_CONF_OPTS) \
+	$(if $(BR2_PACKAGE_FFTW_PRECISION_SINGLE),--enable,--disable)-single \
+	$(if $(BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE),--enable,--disable)-long-double \
+	$(if $(BR2_PACKAGE_FFTW_PRECISION_QUAD),--enable,--disable)-quad-precision \
+	CFLAGS="$(FFTW_COMMON_CFLAGS)"
 
 $(eval $(autotools-package))