diff --git a/Makefile b/Makefile
index 667ddfb..e5723a7 100644
--- a/Makefile
+++ b/Makefile
@@ -105,7 +105,7 @@ static: FLAGS += -static -DGLIBC_NO_STATIC_NSS
 static: clean all
 
 seccomp.h: seccomp.sh $(PASST_SRCS) $(PASST_HEADERS)
-	@ EXTRA_SYSCALLS="$(EXTRA_SYSCALLS)" ./seccomp.sh $(PASST_SRCS) $(PASST_HEADERS)
+	@ EXTRA_SYSCALLS="$(EXTRA_SYSCALLS)" ARCH="$(TARGET_ARCH)" CC="$(CC)" ./seccomp.sh $(PASST_SRCS) $(PASST_HEADERS)
 
 passt: $(PASST_SRCS) $(HEADERS)
 	$(CC) $(FLAGS) $(CFLAGS) $(CPPFLAGS) $(PASST_SRCS) -o passt $(LDFLAGS)
diff --git a/seccomp.sh b/seccomp.sh
index 31ea8da..b075efd 100755
--- a/seccomp.sh
+++ b/seccomp.sh
@@ -17,6 +17,9 @@ TMP="$(mktemp)"
 IN="$@"
 OUT="seccomp.h"
 
+[ -z "${ARCH}" ] && ARCH="$(uname -m)"
+[ -z "${CC}" ] && CC="cc"
+
 HEADER="/* This file was automatically generated by $(basename ${0}) */
 
 #ifndef AUDIT_ARCH_PPC64LE
@@ -110,7 +113,7 @@ log2() {
 # $1:	Name of syscall
 syscall_nr() {
 	__in="$(printf "#include <asm-generic/unistd.h>\n#include <sys/syscall.h>\n__NR_%s" ${1})"
-	__out="$(echo "${__in}" | cc -E -xc - -o - | tail -1)"
+	__out="$(echo "${__in}" | ${CC} -E -xc - -o - | tail -1)"
 	[ "${__out}" = "__NR_$1" ] && return 1
 
 	# Output might be in the form "(x + y)" (seen on armv6l, armv7l)
@@ -125,7 +128,7 @@ filter() {
 		case ${__c} in
 		*:*)
 			case ${__c} in
-			$(uname -m):*)
+			${ARCH}:*)
 				__arch_match=1
 				__c=${__c##*:}
 				;;