diff --git a/jsrc/viavx.c b/jsrc/viavx.c
index af333aba4..493493426 100644
--- a/jsrc/viavx.c
+++ b/jsrc/viavx.c
@@ -7,10 +7,10 @@
 
 #include "j.h"
 #include "vcomp.h"
-#include "viavx.h"
 
 // platforms with hardware crc32c
 #if C_CRC32C && SY_64
+#include "viavx.h"
 
 #if !(C_AVX || EMU_AVX)
 #error need avx or emulation to work
diff --git a/jsrc/viavx1-2.c b/jsrc/viavx1-2.c
index 307c19ad1..d58348327 100644
--- a/jsrc/viavx1-2.c
+++ b/jsrc/viavx1-2.c
@@ -1,3 +1,6 @@
+#include "j.h"
+#if C_CRC32C && SY_64
 #define suff
 #define TH US
 #include "viavx1.h"
+#endif
diff --git a/jsrc/viavx1-4.c b/jsrc/viavx1-4.c
index 1367f601f..7d69d5bc4 100644
--- a/jsrc/viavx1-4.c
+++ b/jsrc/viavx1-4.c
@@ -1,3 +1,6 @@
+#include "j.h"
+#if C_CRC32C && SY_64
 #define suff 2
 #define TH UI4
 #include "viavx1.h"
+#endif
diff --git a/jsrc/viavx1.h b/jsrc/viavx1.h
index ac5e48a6b..c3af95691 100644
--- a/jsrc/viavx1.h
+++ b/jsrc/viavx1.h
@@ -1,4 +1,3 @@
-#include "j.h"
 #include "viavx.h"
 
 // requires: suff and TH to be defined
diff --git a/jsrc/viavx2.c b/jsrc/viavx2.c
index e86ea1c64..7aeaedbb6 100644
--- a/jsrc/viavx2.c
+++ b/jsrc/viavx2.c
@@ -1,4 +1,5 @@
 #include "j.h"
+#if C_CRC32C && SY_64
 #include "viavx.h"
 
 // ********************* i., second class: tolerant comparisons, possibly boxed **********************
@@ -212,3 +213,4 @@ IOFT(D,UI4,jtiod12,HIDMSK(v), TFINDXYT,TFINDY1T,TFINDY1TKEY,*v!=av[hj],
 IOFT(A,UI4,jtioa2, cthia(ctmask,1.0,C(*v)),TFINDBX,TFINDBY,TFINDBYKEY,!eqa(n,v,av+n*hj),          !eqa(n,v,av+n*hj), D x)
 // singleton box
 IOFT(A,UI4,jtioa12,cthia(ctmask,1.0,C(*v)),TFINDBX,TFINDBY,TFINDBYKEY,!equ(C(*v),C(av[hj])),!equ(C(*v),C(av[hj])),  D x)
+#endif
diff --git a/jsrc/viavx3.c b/jsrc/viavx3.c
index 12bd23e21..d5ebe688a 100644
--- a/jsrc/viavx3.c
+++ b/jsrc/viavx3.c
@@ -1,4 +1,5 @@
 #include "j.h"
+#if C_CRC32C && SY_64
 #include "viavx.h"
 
 // ********************* i., third class: small-range arguments ****************************
@@ -160,4 +161,4 @@ IOFSMALLRANGE(jtio12,UC, US)  IOFSMALLRANGE(jtio14,UC, UI4)  // 1-byte items, us
 IOFSMALLRANGE(jtio22,US, US)  IOFSMALLRANGE(jtio24,US, UI4)  // 2-byte items, using small/large hashtable
 IOFSMALLRANGE(jtio42,UI4,US)  IOFSMALLRANGE(jtio44,UI4,UI4)  // 4-byte items, using small/large hashtable
 IOFSMALLRANGE(jtio82,I,  US)  IOFSMALLRANGE(jtio84,I,  UI4)  // SZI-byte items, using small/large hashtable
-
+#endif
diff --git a/jsrc/viavx4.c b/jsrc/viavx4.c
index 6dfd95046..e3eb0d537 100644
--- a/jsrc/viavx4.c
+++ b/jsrc/viavx4.c
@@ -1,10 +1,10 @@
 #include "j.h"
+#if C_CRC32C && SY_64
 #include "viavx.h"
 
 // ******************* i., fourth class: sequential comparison ***************************************
 // implemented only for i. i: e. u/.   - perhaps should revert for other compounds
 
-
 // fz=bit0 = commutative, bit1 set if incomplete y must be filled with 0 (to avoid isub oflo), bit2 set if incomplete x must be filled with i (for fdiv NaN),
 // bit3 set for int-to-float on x, bit4 for int-to-float on y
 // bit5 set to suppress loop-unrolling
@@ -164,3 +164,4 @@ A jtiosc(J jt,I mode,I n,I asct,I wsct,I ac,I wc,A a,A w,A z){I j,p,q; void *u,*
  }
  R z;  // return non-error indic, but also where the partition count for IFORKEY is stored
 }    /* right argument cell is scalar or list; only for modes IIDOT IICO IEPS, and intolerant IFORKEY */
+#endif
diff --git a/jsrc/viavx5.c b/jsrc/viavx5.c
index c24e37940..ef7af9ba0 100644
--- a/jsrc/viavx5.c
+++ b/jsrc/viavx5.c
@@ -1,4 +1,5 @@
 #include "j.h"
+#if C_CRC32C && SY_64
 #include "viavx.h"
 
 // ***************** i., fifth class: boxed arguments ************************
@@ -112,3 +113,4 @@ IOF(jtiobs){A*av,*wv,y;B *yb,*zb;C*zc;I acn,*hu,*hv,l,m1,md,s,wcn,*zi,*zv;
  }}
  R h;
 }    /* a i.!.0 w on boxed a,w by grading and binary search */
+#endif
diff --git a/jsrc/viavx6.c b/jsrc/viavx6.c
index 4b32ab166..a07f3724d 100644
--- a/jsrc/viavx6.c
+++ b/jsrc/viavx6.c
@@ -1,4 +1,5 @@
 #include "j.h"
+#if C_CRC32C && SY_64
 #include "viavx.h"
 
 // *************************** sixth class: hashing w ***********************
@@ -80,3 +81,4 @@ IOFXW(D, UI4,jtiowc012,,hic01((UIL*)v),   *v!=wv[hj],                1) // float
 IOFXW(Z, UI4,jtiowz012,,hic0(2,(UIL*)v),  (v[0].re!=wv[hj].re)||(v[0].im!=wv[hj].im), 1) // complex atom
 IOFXW(D, UI4,jtiowc02,, hic0(n,(UIL*)v),  fcmp0(v,&wv[n*hj],n),           cn) // float array
 IOFXW(Z, UI4,jtiowz02,, hic0(2*n,(UIL*)v),fcmp0((D*)v,(D*)&wv[n*hj],2*n),  cn) // complex array
+#endif