diff --git a/android/external/arm64-v8a/Makefile b/android/external/arm64-v8a/Makefile
index 02a2908..70ebab3 100644
--- a/android/external/arm64-v8a/Makefile
+++ b/android/external/arm64-v8a/Makefile
@@ -91,7 +91,7 @@ showsetup:
 # libiconv
 
 libiconv.src.stamp: ../downloads/libiconv-1.15.tar.gz
-	tar xvfz $<
+	tar xvf $<
 	mv libiconv-1.15 libiconv
 	touch $@
 
@@ -127,7 +127,7 @@ libiconv-install: $(LOCAL)/lib/libiconv.a
 # libetpan
 libetpan.src.stamp: ../downloads/libetpan.tar.gz
 	mkdir -p libetpan
-	cd libetpan && tar xvfz ../$<
+	cd libetpan && tar xvf ../$<
 	touch $@
 
 libetpan/Makefile: libetpan.src.stamp | libiconv-install
diff --git a/android/external/armeabi-v7a/Makefile b/android/external/armeabi-v7a/Makefile
index dcc0873..9ea17a8 100644
--- a/android/external/armeabi-v7a/Makefile
+++ b/android/external/armeabi-v7a/Makefile
@@ -148,7 +148,7 @@ libetpan-clean:
 # using released package from debian. official ftp wasn't available today
 
 uuid.src.stamp: ../downloads/ossp-uuid_1.6.2.orig.tar.gz
-	tar xvfz $<
+	tar xvf $<
 	mv uuid-1.6.2 uuid
 	touch $@
 
diff --git a/android/external/x86/Makefile b/android/external/x86/Makefile
index 05a48bf..3e90334 100644
--- a/android/external/x86/Makefile
+++ b/android/external/x86/Makefile
@@ -91,7 +91,7 @@ showsetup:
 # libiconv
 
 libiconv.src.stamp: ../downloads/libiconv-1.15.tar.gz
-	tar xvfz $<
+	tar xvf $<
 	mv libiconv-1.15 libiconv
 	touch $@
 
@@ -127,7 +127,7 @@ libiconv-install: $(LOCAL)/lib/libiconv.a
 # libetpan
 libetpan.src.stamp: ../downloads/libetpan.tar.gz
 	mkdir -p libetpan
-	cd libetpan && tar xvfz ../$<
+	cd libetpan && tar xvf ../$<
 	touch $@
 
 libetpan/Makefile: libetpan.src.stamp | libiconv-install
diff --git a/android/external/x86_64/Makefile b/android/external/x86_64/Makefile
index d78b54a..a30b1c3 100644
--- a/android/external/x86_64/Makefile
+++ b/android/external/x86_64/Makefile
@@ -91,7 +91,7 @@ showsetup:
 # libiconv
 
 libiconv.src.stamp: ../downloads/libiconv-1.15.tar.gz
-	tar xvfz $<
+	tar xvf $<
 	mv libiconv-1.15 libiconv
 	touch $@
 
@@ -127,7 +127,7 @@ libiconv-install: $(LOCAL)/lib/libiconv.a
 # libetpan
 libetpan.src.stamp: ../downloads/libetpan.tar.gz
 	mkdir -p libetpan
-	cd libetpan && tar xvfz ../$<
+	cd libetpan && tar xvf ../$<
 	touch $@
 
 libetpan/Makefile: libetpan.src.stamp | libiconv-install