diff --git a/Makefile b/Makefile
index e68b106..0939341 100644
--- a/Makefile
+++ b/Makefile
@@ -634,9 +634,9 @@
 endif
 
 ifeq ($(NEED_FTDI), yes)
-FTDILIBS := $(shell ([ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ); pkg-config --libs libftdi1 || pkg-config --libs libftdi || printf "%s" "-lftdi -lusb")
+FTDILIBS := $(shell [ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ; pkg-config --libs libftdi1 || pkg-config --libs libftdi || printf "%s" "-lftdi -lusb")
 FEATURE_CFLAGS += $(shell LC_ALL=C grep -q "FT232H := yes" .features && printf "%s" "-D'HAVE_FT232H=1'")
-FTDI_INCLUDES := $(shell ([ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ); pkg-config --cflags-only-I libftdi1)
+FTDI_INCLUDES := $(shell [ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ; pkg-config --cflags-only-I libftdi1)
 FEATURE_CFLAGS += $(FTDI_INCLUDES)
 FEATURE_LIBS += $(shell LC_ALL=C grep -q "FTDISUPPORT := yes" .features && printf "%s" "$(FTDILIBS)")
 # We can't set NEED_USB here because that would transform libftdi auto-enabling
@@ -761,7 +761,7 @@
 ifeq ($(NEED_USB), yes)
 CHECK_LIBUSB0 = yes
 FEATURE_CFLAGS += -D'NEED_USB=1'
-USBLIBS := $(shell ([ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ); pkg-config --libs libusb || printf "%s" "-lusb")
+USBLIBS := $(shell [ -n "$(PKG_CONFIG_LIBDIR)" ] && export PKG_CONFIG_LIBDIR="$(PKG_CONFIG_LIBDIR)" ; pkg-config --libs libusb || printf "%s" "-lusb")
 endif
 
 ifeq ($(CONFIG_PRINT_WIKI), yes)