diff --git a/Makefile b/Makefile
index dfea6ee2d3e3cf..de6dae1d2729da 100644
--- a/Makefile
+++ b/Makefile
@@ -102,7 +102,7 @@ $(NODE_EXE): build_type:=Release
 $(NODE_G_EXE): build_type:=Debug
 $(NODE_EXE) $(NODE_G_EXE): config.gypi out/Makefile
 	$(MAKE) -C out BUILDTYPE=${build_type} V=$(V)
-	if [ ! -r $@ -o ! -L $@ ]; then \
+	if [ ! -r $@ ] || [ ! -L $@ ]; then \
 	  ln -fs out/${build_type}/$(NODE_EXE) $@; fi
 else
 ifeq ($(BUILD_WITH), ninja)
@@ -116,11 +116,11 @@ else
 endif
 $(NODE_EXE): config.gypi out/Release/build.ninja
 	ninja -C out/Release $(NINJA_ARGS)
-	if [ ! -r $@ -o ! -L $@ ]; then ln -fs out/Release/$(NODE_EXE) $@; fi
+	if [ ! -r $@ ] || [ ! -L $@ ]; then ln -fs out/Release/$(NODE_EXE) $@; fi
 
 $(NODE_G_EXE): config.gypi out/Debug/build.ninja
 	ninja -C out/Debug $(NINJA_ARGS)
-	if [ ! -r $@ -o ! -L $@ ]; then ln -fs out/Debug/$(NODE_EXE) $@; fi
+	if [ ! -r $@ ] || [ ! -L $@ ]; then ln -fs out/Debug/$(NODE_EXE) $@; fi
 else
 $(NODE_EXE) $(NODE_G_EXE):
 	$(warning This Makefile currently only supports building with 'make' or 'ninja')
@@ -906,7 +906,7 @@ BINARYTAR=$(BINARYNAME).tar
 HAS_XZ ?= $(shell command -v xz > /dev/null 2>&1; [ $$? -eq 0 ] && echo 1 || echo 0)
 # Supply SKIP_XZ=1 to explicitly skip .tar.xz creation
 SKIP_XZ ?= 0
-XZ = $(shell [ $(HAS_XZ) -eq 1 -a $(SKIP_XZ) -eq 0 ] && echo 1 || echo 0)
+XZ = $(shell [ $(HAS_XZ) -eq 1 ] && [ $(SKIP_XZ) -eq 0 ] && echo 1 || echo 0)
 XZ_COMPRESSION ?= 9e
 PKG=$(TARNAME).pkg
 MACOSOUTDIR=out/macos
@@ -947,7 +947,7 @@ release-only: check-xz
 		echo "" >&2 ; \
 		exit 1 ; \
 	fi
-	@if [ "$(DISTTYPE)" != "release" -o "$(RELEASE)" = "1" ]; then \
+	@if [ "$(DISTTYPE)" != "release" ] || [ "$(RELEASE)" = "1" ]; then \
 		exit 0; \
 	else \
 		echo "" >&2 ; \
@@ -956,7 +956,7 @@ release-only: check-xz
 		echo "" >&2 ; \
 		exit 1 ; \
 	fi
-	@if [ "$(RELEASE)" = "0" -o -f "$(CHANGELOG)" ]; then \
+	@if [ "$(RELEASE)" = "0" ] || [ -f "$(CHANGELOG)" ]; then \
 		exit 0; \
 	else \
 		echo "" >&2 ; \
diff --git a/android-configure b/android-configure
index ecb13f399e4d5d..43341d1abea765 100755
--- a/android-configure
+++ b/android-configure
@@ -56,7 +56,7 @@ export CXX_host=$(command -v g++)
 host_gcc_version=$($CC_host --version | grep gcc | awk '{print $NF}')
 major=$(echo $host_gcc_version | awk -F . '{print $1}')
 minor=$(echo $host_gcc_version | awk -F . '{print $2}')
-if [ -z $major ] || [ -z $minor ] || [ $major -lt 6 ] || [ $major -eq 6 -a $minor -lt 3 ]; then
+if [ -z $major ] || [ -z $minor ] || [ $major -lt 6 ] || ( [ $major -eq 6 ] && [ $minor -lt 3 ] ); then
   echo "host gcc $host_gcc_version is too old, need gcc 6.3.0"
   return 1
 fi