diff -Nur nss-3.27.1.orig/nss/cmd/platlibs.mk nss-3.27.1/nss/cmd/platlibs.mk
--- nss-3.27.1.orig/nss/cmd/platlibs.mk	2016-10-03 16:55:58 +0200
+++ nss-3.27.1/nss/cmd/platlibs.mk	2016-10-19 15:47:24 +0200
@@ -178,7 +178,11 @@
 	$(NULL)
 
 ifeq ($(OS_ARCH), AIX) 
+ifeq ($(NS_AIX_XLC), 1)
 EXTRA_SHARED_LIBS += -brtl 
+else
+EXTRA_SHARED_LIBS += -Wl,-brtl 
+endif
 endif
 
 # $(PROGRAM) has NO explicit dependencies on $(EXTRA_SHARED_LIBS)
@@ -224,7 +228,11 @@
 	$(NULL)
 
 ifeq ($(OS_ARCH), AIX) 
+ifeq ($(NS_AIX_XLC), 1)
 EXTRA_SHARED_LIBS += -brtl 
+else
+EXTRA_SHARED_LIBS += -Wl,-brtl 
+endif
 endif
 
 # $(PROGRAM) has NO explicit dependencies on $(EXTRA_SHARED_LIBS)
diff -Nur nss-3.27.1.orig/nss/coreconf/AIX.mk nss-3.27.1/nss/coreconf/AIX.mk
--- nss-3.27.1.orig/nss/coreconf/AIX.mk	2016-10-03 16:55:58 +0200
+++ nss-3.27.1/nss/coreconf/AIX.mk	2016-10-19 15:46:25 +0200
@@ -28,20 +28,43 @@
 	PTHREADS_USER = 1
 endif
 
-DEFAULT_COMPILER = xlc_r
+DSO_LDOPTS	= -brtl -bnortllib -bM:SRE -bnoentry
 
-CC		= xlc_r
-CCC		= xlC_r
+ifeq ($(NS_AIX_XLC), 1)
+	DEFAULT_COMPILER = xlc_r
+	CC		= /usr/vac/bin/xlc_r
+	CCC		= /usr/vacpp/bin/xlC_r
+	OS_LIBS 	+= -blibpath:/opt/freeware/lib:/usr/lib:/lib -lc -lm
+    ifeq ($(USE_64), 1)
+		CC	= /usr/vac/bin/xlc_r -q64
+		CCC	= /usr/vacpp/bin/xlC_r -q64
+		OS_LIBS	+= -blibpath:/opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib -lc -lm
+    endif
+	MKSHLIB 	= $(LD) $(DSO_LDOPTS) -blibpath:/usr/lib:/lib -lc -lm
+else
+	DEFAULT_COMPILER = gcc
+	CC		= /opt/freeware/bin/gcc
+	CCC		= /opt/freeware/bin/g++
+	CFLAGS	= -Wl,-blibpath:/opt/freeware/lib:/usr/lib:/lib $(NSS_INCLUDES) -DMOZILLA_CLIENT -DSHLIB_PREFIX=\"lib\" -DSHLIB_SUFFIX=\"so\" -DDLL_PREFIX=\"lib\" -DDLL_SUFFIX=\"so\"
+	OS_LIBS 	+= -lc -lm -L/opt/freeware/lib -lgcc_s -lpthread
+	ifeq ($(USE_64), 1)
+		CC	= /opt/freeware/bin/gcc -maix64
+		CCC	= /opt/freeware/bin/g++ -maix64
+		CFLAGS	= -Wl,-blibpath:/opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib $(NSS_INCLUDES) -DMOZILLA_CLIENT -DSHLIB_PREFIX=\"lib\" -DSHLIB_SUFFIX=\"so\" -DDLL_PREFIX=\"lib\" -DDLL_SUFFIX=\"so\"
+		OS_LIBS 	+= -lc -lm -L/opt/freeware/lib64 -lgcc_s -lpthread
+	endif
+	WARNING_CFLAGS	= 
+	MKSHLIB 	= $(LD) $(DSO_LDOPTS) -blibpath:/opt/freeware/lib:/usr/lib:/lib -lc -lm -L/opt/freeware/lib -lgcc_s -lpthread
+	ifeq ($(USE_64), 1)
+		MKSHLIB         = $(LD) $(DSO_LDOPTS) -blibpath:/opt/freeware/lib64:/opt/freeware/lib:/usr/lib:/lib -lc -lm -L/opt/freeware/lib64 -lgcc_s -lpthread
+	endif
+endif
 
 CPU_ARCH	= rs6000
 
 RANLIB		= ranlib
 
 OS_CFLAGS	= -DAIX -DSYSV
-OS_LIBS 	+= -blibpath:/usr/lib:/lib -lc -lm
-
-DSO_LDOPTS	= -brtl -bnortllib -bM:SRE -bnoentry
-MKSHLIB 	= $(LD) $(DSO_LDOPTS) -blibpath:/usr/lib:/lib -lc -lm
 
 AIX_WRAP	= $(DIST)/lib/aixwrap.o
 AIX_TMP		= $(OBJDIR)/_aix_tmp.o
--- ./nss/Makefile.orig	2021-01-15 00:10:15 +0000
+++ ./nss/Makefile	2021-01-15 00:11:29 +0000
@@ -89,7 +89,7 @@
 NSPR_CONFIGURE_OPTS += --enable-static-rtl
 endif
 ifdef NS_USE_GCC
-NSPR_CONFIGURE_ENV = CC=gcc CXX=g++
+NSPR_CONFIGURE_ENV = CC="$(CC)" CXX="$(CXX)"
 endif
 # Make sure to remove -arch arguments. NSPR can't handle that.
 remove_arch = $(filter-out __REMOVEME%,$(subst $(NULL) -arch , __REMOVEME,$(1)))