diff --git a/lib/ft4/ft4_downsample.f90 b/lib/ft4/ft4_downsample.f90
index bbe53a2a2..a6305c830 100644
--- a/lib/ft4/ft4_downsample.f90
+++ b/lib/ft4/ft4_downsample.f90
@@ -31,7 +31,7 @@ subroutine ft4_downsample(dd,newdata,f0,c)
 
    if(newdata) then
       x=dd
-      call four2a(x,NMAX,1,-1,0)             !r2c FFT to freq domain
+      call four2a(cx,NMAX,1,-1,0)             !r2c FFT to freq domain
    endif
    i0=nint(f0/df)
    c1=0.
diff --git a/lib/ft8/filt8.f90 b/lib/ft8/filt8.f90
index abe797ba7..6b39c0434 100644
--- a/lib/ft8/filt8.f90
+++ b/lib/ft8/filt8.f90
@@ -35,7 +35,7 @@ subroutine filt8(f0,nslots,width,wave)
 !###
   if(nslots.ne.99) return
   x=wave
-  call four2a(x,NFFT,1,-1,0)              !r2c
+  call four2a(cx,NFFT,1,-1,0)              !r2c
   do i=0,NH
      s1(i)=real(cx(i))**2 + aimag(cx(i))**2
   enddo
diff --git a/lib/ft8/foxfilt.f90 b/lib/ft8/foxfilt.f90
index d97923a8f..6ad46a473 100644
--- a/lib/ft8/foxfilt.f90
+++ b/lib/ft8/foxfilt.f90
@@ -9,7 +9,7 @@ subroutine foxfilt(nslots,nfreq,width,wave)
 
   x(1:NWAVE)=wave
   x(NWAVE+1:)=0.
-  call four2a(x,NFFT,1,-1,0)              !r2c
+  call four2a(cx,NFFT,1,-1,0)              !r2c
   df=48000.0/NFFT
   fa=nfreq - 0.5*6.25
   fb=nfreq + 7.5*6.25 + (nslots-1)*60.0
diff --git a/lib/wsprd/jelinek.h b/lib/wsprd/jelinek.h
index 64ecdb963..82ce1deb4 100644
--- a/lib/wsprd/jelinek.h
+++ b/lib/wsprd/jelinek.h
@@ -10,8 +10,6 @@ struct snode {
     unsigned int jpointer;
 };
 
-struct snode *stack;
-
 int jelinek(unsigned int *metric,
             unsigned int *cycles,
             unsigned char *data,
diff --git a/lib/wsprd/nhash.c b/lib/wsprd/nhash.c
index 9376954fa..e97a528d9 100644
--- a/lib/wsprd/nhash.c
+++ b/lib/wsprd/nhash.c
@@ -348,17 +348,17 @@ uint32_t nhash( const void *key, size_t length, uint32_t initval)
     /*-------------------------------- last block: affect all 32 bits of (c) */
     switch(length)                   /* all the case statements fall through */
     {
-    case 12: c+=((uint32_t)k[11])<<24;
-    case 11: c+=((uint32_t)k[10])<<16;
-    case 10: c+=((uint32_t)k[9])<<8;
-    case 9 : c+=k[8];
-    case 8 : b+=((uint32_t)k[7])<<24;
-    case 7 : b+=((uint32_t)k[6])<<16;
-    case 6 : b+=((uint32_t)k[5])<<8;
-    case 5 : b+=k[4];
-    case 4 : a+=((uint32_t)k[3])<<24;
-    case 3 : a+=((uint32_t)k[2])<<16;
-    case 2 : a+=((uint32_t)k[1])<<8;
+    case 12: c+=((uint32_t)k[11])<<24; __attribute__ ((fallthrough));
+    case 11: c+=((uint32_t)k[10])<<16; __attribute__ ((fallthrough));
+    case 10: c+=((uint32_t)k[9])<<8; __attribute__ ((fallthrough));
+    case 9 : c+=k[8]; __attribute__ ((fallthrough));
+    case 8 : b+=((uint32_t)k[7])<<24; __attribute__ ((fallthrough));
+    case 7 : b+=((uint32_t)k[6])<<16; __attribute__ ((fallthrough));
+    case 6 : b+=((uint32_t)k[5])<<8; __attribute__ ((fallthrough));
+    case 5 : b+=k[4]; __attribute__ ((fallthrough));
+    case 4 : a+=((uint32_t)k[3])<<24; __attribute__ ((fallthrough));
+    case 3 : a+=((uint32_t)k[2])<<16; __attribute__ ((fallthrough));
+    case 2 : a+=((uint32_t)k[1])<<8; __attribute__ ((fallthrough));
     case 1 : a+=k[0];
              break;
     case 0 : return c;
diff --git a/lib/wsprd/wsprd.c b/lib/wsprd/wsprd.c
index b37ffe9c0..2e3b385da 100644
--- a/lib/wsprd/wsprd.c
+++ b/lib/wsprd/wsprd.c
@@ -748,6 +748,7 @@ int main(int argc, char *argv[])
     int writec2=0,maxdrift;
     int shift1, lagmin, lagmax, lagstep, ifmin, ifmax, not_decoded;
     unsigned int nbits=81, stacksize=200000;
+    struct snode * stack=NULL;
     unsigned int npoints, cycles, maxnp, metric;
     float df=375.0/256.0/2;
     float fsymbs[162];
@@ -1334,7 +1335,7 @@ int main(int argc, char *argv[])
                         deinterleave(symbols);
                         t0 = clock();
                         
-                        if ( stackdecoder ) {
+                        if ( stack ) {
                             not_decoded = jelinek(&metric, &cycles, decdata, symbols, nbits,
                                                   stacksize, stack, mettab,maxcycles);
                         } else {
@@ -1566,9 +1567,7 @@ int main(int argc, char *argv[])
     free(call_loc_pow);
     free(idat);
     free(qdat);
-    if( stackdecoder ) {
-        free(stack);
-    }
+    free(stack);
     
     return 0;
 }