add 'SHELL=bash' hints where necessary, so it works on systems where /bin/sh isn't a Bash

Makefile

@@ -10,6 +10,7 @@ PREFIX  := $(PWD)/usr
 PKG_DIR := $(PWD)/pkg
 TMP_DIR  = $(PWD)/tmp-$(1)
 PATH    := $(PREFIX)/bin:$(PATH)
+SHELL   := bash
 SED     := $(shell gsed --version >/dev/null 2>&1 && echo g)sed
 
 PKG_RULES := $(patsubst src/%.mk,%,$(wildcard src/*.mk))

src/gettext.mk

@@ -21,5 +21,5 @@ define $(PKG)_BUILD
         --disable-shared \
         --prefix='$(PREFIX)/$(TARGET)' \
         --enable-threads=win32
-    $(MAKE) -C '$(1)/intl' -j '$(JOBS)' install
+    $(MAKE) -C '$(1)/intl' -j '$(JOBS)' SHELL=bash install
 endef