diff --git a/configure/os/CONFIG.Common.solaris-sparc b/configure/os/CONFIG.Common.solaris-sparc
index 830a8b984..6510dcbdf 100644
--- a/configure/os/CONFIG.Common.solaris-sparc
+++ b/configure/os/CONFIG.Common.solaris-sparc
@@ -20,12 +20,8 @@ COMPILER_LDFLAGS += -mt
 
 SOLARIS_VERSION = $(subst 5.,,$(shell uname -r))
 
-# Flags for solaris 6
-POSIX_CPPFLAGS_YES_6 += -D_REENTRANT
-
 POSIX_CPPFLAGS_YES += -D_POSIX_C_SOURCE=199506L $(POSIX_CPPFLAGS_YES_$(SOLARIS_VERSION))
 POSIX_CPPFLAGS_YES += -D_XOPEN_SOURCE=500
-POSIX_LDLIBS_YES_6 += -lthread
 POSIX_LDLIBS_YES += -lposix4 -lpthread $(POSIX_LDLIBS_YES_$(SOLARIS_VERSION))
 
 OP_SYS_CPPFLAGS += -DSOLARIS=$(SOLARIS_VERSION) $(COMPILER_CPPFLAGS)
diff --git a/configure/os/CONFIG.Common.solaris-x86 b/configure/os/CONFIG.Common.solaris-x86
index b2a9185bf..e5ebf8c0a 100644
--- a/configure/os/CONFIG.Common.solaris-x86
+++ b/configure/os/CONFIG.Common.solaris-x86
@@ -20,12 +20,8 @@ COMPILER_LDFLAGS += -mt
 
 SOLARIS_VERSION = $(subst 5.,,$(shell uname -r))
 
-# Flags for solaris 6
-POSIX_CPPFLAGS_YES_6 += -D_REENTRANT
-
 POSIX_CPPFLAGS_YES += -D_POSIX_C_SOURCE=199506L $(POSIX_CPPFLAGS_YES_$(SOLARIS_VERSION))
 POSIX_CPPFLAGS_YES += -D_XOPEN_SOURCE=500
-POSIX_LDLIBS_YES_6 += -lthread
 POSIX_LDLIBS_YES += -lposix4 -lpthread $(POSIX_LDLIBS_YES_$(SOLARIS_VERSION))
 
 OP_SYS_CPPFLAGS += -DSOLARIS=$(SOLARIS_VERSION) $(COMPILER_CPPFLAGS)