diff --git a/CMakeLists.txt b/CMakeLists.txt
index 08b446f..aa1cdc4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,11 @@ if(NOT KISSFFT_FLOAT_TYPE IN_LIST KISSFFT_FLOAT_TYPE_VALID)
 endif()
 
 add_library(kissfft
-  kiss_fft.c)
+  kiss_fft.c
+  tools/kfc.c
+  tools/kiss_fftnd.c
+  tools/kiss_fftndr.c
+  tools/kiss_fftr.c)
 
 target_include_directories(kissfft PUBLIC
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
@@ -114,7 +118,13 @@ if (KISSFFT_INSTALL)
         ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
         LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
         RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
-    install(FILES "kiss_fft.h" "kissfft.hh" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
+    install(FILES kiss_fft.h
+                  kissfft.hh
+                  tools/kfc.h
+                  tools/kiss_fftnd.h
+                  tools/kiss_fftndr.h
+                  tools/kiss_fftr.h
+            DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
 
     set(KISSFFT_INSTALL_CMAKE "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" CACHE FILEPATH "Install destination of kissfft cmake modules")
     mark_as_advanced(KISSFFT_INSTALL_CMAKE)
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index fd225ad..2c8cc59 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -1,10 +1,10 @@
-add_kissfft_executable(fastconvr kiss_fastfir.c kiss_fftr.c)
+add_kissfft_executable(fastconvr kiss_fastfir.c)
 target_compile_definitions(fastconvr PRIVATE REAL_FASTFIR FAST_FILT_UTIL)
 
 add_kissfft_executable(fastconv kiss_fastfir.c)
 target_compile_definitions(fastconv PRIVATE FAST_FILT_UTIL)
 
-add_kissfft_executable(fft fftutil.c kiss_fftnd.c kiss_fftr.c kiss_fftndr.c)
+add_kissfft_executable(fft fftutil.c)
 
 
 if (KISSFFT_INSTALL)
@@ -19,7 +19,7 @@ endif()
 if(NOT KISSFFT_DATATYPE MATCHES "simd")
     include(FindPkgConfig)
     pkg_check_modules(libpng REQUIRED IMPORTED_TARGET libpng)
-    add_kissfft_executable(psdpng psdpng.c kiss_fftr.c)
+    add_kissfft_executable(psdpng psdpng.c)
     target_link_libraries(psdpng PRIVATE PkgConfig::libpng)
     if (KISSFFT_INSTALL)
 	install(TARGETS psdpng
diff --git a/tools/kfc.h b/tools/kfc.h
index a5cdd16..d7d8c1b 100644
--- a/tools/kfc.h
+++ b/tools/kfc.h
@@ -40,12 +40,12 @@ call kfc_cleanup.
  */
 
 /*forward complex FFT */
-void kfc_fft(int nfft, const kiss_fft_cpx * fin,kiss_fft_cpx * fout);
+void KISS_FFT_API kfc_fft(int nfft, const kiss_fft_cpx * fin,kiss_fft_cpx * fout);
 /*reverse complex FFT */
-void kfc_ifft(int nfft, const kiss_fft_cpx * fin,kiss_fft_cpx * fout);
+void KISS_FFT_API kfc_ifft(int nfft, const kiss_fft_cpx * fin,kiss_fft_cpx * fout);
 
 /*free all cached objects*/
-void kfc_cleanup(void);
+void KISS_FFT_API kfc_cleanup(void);
 
 #ifdef __cplusplus
 }
diff --git a/tools/kiss_fftnd.h b/tools/kiss_fftnd.h
index 9bbc002..956ba94 100644
--- a/tools/kiss_fftnd.h
+++ b/tools/kiss_fftnd.h
@@ -17,8 +17,8 @@ extern "C" {
 
 typedef struct kiss_fftnd_state * kiss_fftnd_cfg;
     
-kiss_fftnd_cfg  kiss_fftnd_alloc(const int *dims,int ndims,int inverse_fft,void*mem,size_t*lenmem);
-void kiss_fftnd(kiss_fftnd_cfg  cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
+kiss_fftnd_cfg KISS_FFT_API kiss_fftnd_alloc(const int *dims,int ndims,int inverse_fft,void*mem,size_t*lenmem);
+void KISS_FFT_API kiss_fftnd(kiss_fftnd_cfg  cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout);
 
 #ifdef __cplusplus
 }
diff --git a/tools/kiss_fftndr.h b/tools/kiss_fftndr.h
index e35c6ff..0d56a1f 100644
--- a/tools/kiss_fftndr.h
+++ b/tools/kiss_fftndr.h
@@ -20,7 +20,7 @@ extern "C" {
 typedef struct kiss_fftndr_state *kiss_fftndr_cfg;
 
 
-kiss_fftndr_cfg  kiss_fftndr_alloc(const int *dims,int ndims,int inverse_fft,void*mem,size_t*lenmem);
+kiss_fftndr_cfg KISS_FFT_API kiss_fftndr_alloc(const int *dims,int ndims,int inverse_fft,void*mem,size_t*lenmem);
 /*
  dims[0] must be even
 
@@ -28,7 +28,7 @@ kiss_fftndr_cfg  kiss_fftndr_alloc(const int *dims,int ndims,int inverse_fft,voi
 */
 
 
-void kiss_fftndr(
+void KISS_FFT_API kiss_fftndr(
         kiss_fftndr_cfg cfg,
         const kiss_fft_scalar *timedata,
         kiss_fft_cpx *freqdata);
@@ -37,7 +37,7 @@ void kiss_fftndr(
  output freqdata has dims[0] X dims[1] X ... X  dims[ndims-1]/2+1 complex points
 */
 
-void kiss_fftndri(
+void KISS_FFT_API kiss_fftndri(
         kiss_fftndr_cfg cfg,
         const kiss_fft_cpx *freqdata,
         kiss_fft_scalar *timedata);
diff --git a/tools/kiss_fftr.h b/tools/kiss_fftr.h
index 588948d..7fd73d2 100644
--- a/tools/kiss_fftr.h
+++ b/tools/kiss_fftr.h
@@ -26,7 +26,7 @@ extern "C" {
 typedef struct kiss_fftr_state *kiss_fftr_cfg;
 
 
-kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
+kiss_fftr_cfg KISS_FFT_API kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
 /*
  nfft must be even
 
@@ -34,13 +34,13 @@ kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenm
 */
 
 
-void kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
+void KISS_FFT_API kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
 /*
  input timedata has nfft scalar points
  output freqdata has nfft/2+1 complex points
 */
 
-void kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
+void KISS_FFT_API kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
 /*
  input freqdata has  nfft/2+1 complex points
  output timedata has nfft scalar points