diff --git a/makefile b/makefile
index afec4b1d..084c26d8 100644
--- a/makefile
+++ b/makefile
@@ -2099,6 +2099,14 @@ ATT3B2M400 = ${ATT3B2D}/3b2_400_cpu.c ${ATT3B2D}/3b2_400_sys.c \
 	${ATT3B2D}/3b2_ni.c
 ATT3B2_OPT = -DUSE_INT64 -DUSE_ADDR64 -I ${ATT3B2D} ${NETWORK_OPT}
 
+SIGMAD = ${SIMHD}/sigma
+SIGMA = ${SIGMAD}/sigma_cpu.c ${SIGMAD}/sigma_sys.c ${SIGMAD}/sigma_cis.c \
+	${SIGMAD}/sigma_coc.c ${SIGMAD}/sigma_dk.c ${SIGMAD}/sigma_dp.c \
+	${SIGMAD}/sigma_fp.c ${SIGMAD}/sigma_io.c ${SIGMAD}/sigma_lp.c \
+	${SIGMAD}/sigma_map.c ${SIGMAD}/sigma_mt.c ${SIGMAD}/sigma_pt.c \
+    ${SIGMAD}/sigma_rad.c ${SIGMAD}/sigma_rtc.c ${SIGMAD}/sigma_tt.c
+SIGMA_OPT = -I ${SIGMAD}
+
 ###
 ### Experimental simulators
 ###
@@ -2118,14 +2126,6 @@ CDC1700_OPT = -I ${CDC1700D}
 ### Unsupported/Incomplete simulators
 ###
 
-SIGMAD = ${SIMHD}/sigma
-SIGMA = ${SIGMAD}/sigma_cpu.c ${SIGMAD}/sigma_sys.c ${SIGMAD}/sigma_cis.c \
-	${SIGMAD}/sigma_coc.c ${SIGMAD}/sigma_dk.c ${SIGMAD}/sigma_dp.c \
-	${SIGMAD}/sigma_fp.c ${SIGMAD}/sigma_io.c ${SIGMAD}/sigma_lp.c \
-	${SIGMAD}/sigma_map.c ${SIGMAD}/sigma_mt.c ${SIGMAD}/sigma_pt.c \
-    ${SIGMAD}/sigma_rad.c ${SIGMAD}/sigma_rtc.c ${SIGMAD}/sigma_tt.c
-SIGMA_OPT = -I ${SIGMAD}
-
 ALPHAD = ${SIMHD}/alpha
 ALPHA = ${ALPHAD}/alpha_500au_syslist.c ${ALPHAD}/alpha_cpu.c \
     ${ALPHAD}/alpha_ev5_cons.c ${ALPHAD}/alpha_ev5_pal.c \
diff --git a/sim_fio.c b/sim_fio.c
index 69a5c8c3..8b45a8e2 100644
--- a/sim_fio.c
+++ b/sim_fio.c
@@ -568,7 +568,7 @@ if ((stbuf.st_mode & S_IFIFO)) {
 return -1;
 }
 
-#if defined (__linux__) || defined (__APPLE__)
+#if defined (__linux__) || defined (__APPLE__) || defined (__CYGWIN__) || defined (__FreeBSD__)
 #include <sys/mman.h>
 
 struct SHMEM {